Malicious PDF — malware analysis report

Static analysis result for SHA-256 8244af38c273261a…

MALICIOUS

PDF

96.1 KB Created: 2021-04-10 07:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 75da69407696aaeda2f49c8ddaafcd68 SHA-1: 2f3bfd6e86bada5d567c44625ed50de4ad1b3f03 SHA-256: 8244af38c273261a982ceebca62e214754651e954a1ad26b67334617ae76439c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to connecting a keyboard to a Firestick, which is likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=how+to+connect+mini+keyboard+to+firestick PDF link annotation
    • https://xojowikenokux.weebly.com/uploads/1/3/4/7/134706662/tiramokob.pdfIn PDF document text
    • http://santecmb-sarl.com/913046983999qfe0.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/7663944.pdfIn PDF document text
    • http://dirtygirl.fun/toyota_corolla_gli_manual_2018_for_sale_in_karachi3w0g6.pdfIn PDF document text
    • http://boothattendant.com/61026017213vm6pc.pdfIn PDF document text
    • http://reform-st.ru/sunbrella_golf_cart_seat_covers_club_carh0l01.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/5668763.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/zivulij.pdfIn PDF document text
    • http://groshyk.site/ropekibenato34yqj.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/noruvafuvipodatev.pdfIn PDF document text
    • http://runolive.com/jacquees_feel_it_downloadan3t4.pdfIn PDF document text
    • http://predouche.xyz/12260787845fg2g2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e254dcda-a581-41ac-9802-3bcbc4b2ba3f/vawonud.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_626ea55ff2754d1b8c56f263d22b1ae3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ef33e1-bd0d-4f33-8be5-f0ed081db047/kuluxipakoxidupuvujafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e49df44-4f7d-4aff-b362-b878d5498c22/what_does_the_term_game_of_chicken_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712ef79b-0519-44f3-a451-e2c3b8977f83/vanity_fair_series_full_cast.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_86d651e196b945c69c5db6b499db4717.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_a62856d440dc4b1fa8ec14087239945a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35694a18-b4b3-429a-bc69-886098f8e0dc/does_sony_bravia_have_hdr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0902a05-f162-460d-a084-d2c9a2c58d17/10065574735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf144b06-f730-4cfe-afeb-3925281b396e/how_to_say_thank_you_in_advance_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff681d3-c747-4fc8-8524-eb5b1d8f3d3c/44378969219.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 3972 bytes
SHA-256: 856893cebc2b458c09f71817fc23c35107c5e93249778a060c07b95039733838
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 5492 bytes
SHA-256: 5054e1d4c7f068e2844aff23025ae59cfcb413edd87748069dc29bcf4d88ca8d
font_03_sfnt_off00013d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D35 2532 bytes
SHA-256: 2ed01a800431d81856155c0908aeaa745912f39882557d1def1cfc6c9b7abd0a
font_04_sfnt_off0001485c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485C 11660 bytes
SHA-256: 1a6dda61c76257d76b75d62cbc387e12ba1b2f54e574a38cf57548566086c7bd

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