Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb449eb2218b0761…

MALICIOUS

PDF

118.4 KB Created: 2021-03-24 10:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c66f099a09393c8860941bbd85daeac SHA-1: a82ba0b78c6704bd27e0070b80ad7af9bf1d5fa2 SHA-256: eb449eb2218b076107e9975120066ea8f925bc1368eda2d7d7edf1fc2441e83b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URIs pointing to other PDF documents hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of external links suggests an attempt to redirect users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=ap+chemistry+solubility+equilibrium+multiple+choice PDF link annotation
    • https://cdn.sqhk.co/dejuxafe/617z16A/sniper_strike_shoot_killer_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_600f1e64778fc.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/JjehgjH/xijixadetur.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/gejbii8/luvurudam.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/jjhtqjd/kme_service_metallpreise.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/148908.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/bihohav/koinal_buy_bitcoin_instantly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_602c260b41153.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/xupid.pdfIn PDF document text
    • https://jikigalogadod.weebly.com/uploads/1/3/4/6/134647375/9437478.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/a5da97f8-e17a-468d-a6ee-cb514f8faf7f/68418270301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddad7e3a-4d68-4c44-bb87-8b8c9a621959/67122576337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6d5606-df31-4fc9-a730-808a790095c5/xopuri.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/nukeritiberowamaken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b57f7b9-16f7-4747-87ef-95a89f22c593/how_do_you_apply_the_bible_to_your_life.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/pathway_atresia_bilier.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000179bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BD 7744 bytes
SHA-256: f85180bfbd8ca1663a89dd43ffbb84a666debe06755114abd2834154333c5c9c
font_01_sfnt_off00018dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD9 5320 bytes
SHA-256: e0125517ff3b49d677ab5156add4db055471121a4fb2fb5b8fde4b22f63fd076
font_02_sfnt_off00019fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD1 13140 bytes
SHA-256: 1dac7b551227bad05eb32544a628b2910a01ff69b14620a7fee1501cdf26caa7

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