Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bac44f78fac386…

MALICIOUS

PDF

75.2 KB Created: 2021-04-01 03:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de64be369a1beba674558c45e7af83e0 SHA-1: 91d8211207d5ce877b5e1f5dc3adea6b068ce8e6 SHA-256: 82bac44f78fac38691396a582b66c5a386e67d34294a4f7c09380fb179441232
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded content, though obfuscated, appears to be part of a lure to direct users to external URLs for potential exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://ponafet.ru/strik?utm_term=do+graco+snugride+bases+expire
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/bodovotixa-rasemanipovi.pdf
    • https://cdn.sqhk.co/waxobakal/ijiDngd/zupagalemepipodere.pdf
    • http://nunovoxiwanafuz.getenjoyment.net/does_ozone_make_good_bikes.pdf
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/f9b59a6566bba4.pdf
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/1715186.pdf
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/3716954.pdf
    • http://fegiroxopirez.sportsontheweb.net/neologismo_semantico.pdf
    • http://dabutaxezopis.iblogger.org/diablo_2_whirlwind_barbarian_skill_guide.pdf
    • http://kapunogukak.iblogger.org/kawofonizirevodezaren.pdf
    • http://zekifafeter.scienceontheweb.net/types_of_indoor_air_pollution.pdf
    • https://bufaxivija.weebly.com/uploads/1/3/1/3/131383981/fejolizi.pdf
    • http://gufosizikok.22web.org/gisuxolewu.pdf
    • https://cdn.sqhk.co/nazamesuwute/jeGPSgf/watch_me_whip_nae_nae_lyrics_meaning.pdf
    • http://diburawu.22web.org/jisaxosisujefebegikiw.pdf
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/pupunulexowakumugumu.pdf
    • http://kafujaguvo.mygamesonline.org/asme_bpvc_section_viii_division_2.pdf
    • https://pifixisoti.weebly.com/uploads/1/3/4/3/134379985/1555134.pdf
    • http://tonojodozif.mypressonline.com/pneumatic_cylinder_operation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zexisudotelil.rf.gd/67068446622.pdf
    • https://uploads.strikinglycdn.com/files/61179dcc-95e2-4f95-a764-75a8e754087b/597584275.pdf
    • https://uploads.strikinglycdn.com/files/08599ea0-a1c2-4715-97d5-94e4f16b3dc1/a_vce_5.9.20_apk_cracked_download.pdf
    • https://uploads.strikinglycdn.com/files/33c6998b-114b-4b2c-9207-fbbdf61bfa1a/51098428987.pdf
    • https://uploads.strikinglycdn.com/files/9bdc1b9b-df34-42c2-8103-0e9aaa3e352e/dixie_chopper_tires_24x11x10.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fc.bin
a7e2ae78c5b3aa777b9f2f641a23572c955e25a0b8c3b8af45c2907ef0329954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 5416 bytes
font_01_sfnt_off0000fb76.bin
065850e9bc0a3dd917515e0eba6f34e08680573ce6484e5f629bd0a9d3bb9eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 10588 bytes

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