Malicious PDF — malware analysis report

Static analysis result for SHA-256 907f0da13cbbbf70…

MALICIOUS

PDF

77.2 KB Created: 2021-02-02 10:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e0274d16d4995d612af764e659c2f10 SHA-1: 43048291c3d4b3c26acd42724de102201e1cfde3 SHA-256: 907f0da13cbbbf7097236ad2cc809449bc66553e78b58afd7e2d89ba3677d2c1
246 Risk Score

Malware Insights

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

This PDF file is identified as a credential phishing lure impersonating Facebook. It contains a mass of external links, many hosted on disposable domains, directing users to a redirector. The primary purpose appears to be to trick users into submitting their Facebook credentials via the embedded links, which likely lead to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xapeposatu.weebly.com/uploads/1/3/1/4/131437079/8bd66553f64eb9.pdf.
  • 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://leonvi.ru/aws?utm_term=android+modify+system+settings+permission PDF link annotation
    • https://xapeposatu.weebly.com/uploads/1/3/1/4/131437079/8bd66553f64eb9.pdfIn PDF document text
    • https://pukibasobudez.weebly.com/uploads/1/3/1/3/131379944/c68a39a824015.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/eqoXMgd/auction_apps_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_600b5b91c1473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fe6fbda7169c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381091/normal_5fed5efa38035.pdfIn PDF document text
    • http://avbox.org/color_detector_pen4gpwv.pdfIn PDF document text
    • https://gapuromediwav.weebly.com/uploads/1/3/0/8/130814643/141708.pdfIn PDF document text
    • http://kraftmann.su/76032190230t326.pdfIn PDF document text
    • http://reduslimitalia.website/jafuraretidusaletevafig3snvg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382414/normal_5ff58adb15793.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/sumep-bubamabulube-desebesulusak.pdfIn PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/1827426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_600c8a48674b5.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/1998803.pdfIn PDF document text
    • https://femidizori.weebly.com/uploads/1/3/4/6/134684525/wuritinaluvoxafopit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fc620e02525d.pdfIn PDF document text
    • http://love-cosmetics.shop/22274769429y3rqh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 5212 bytes
SHA-256: e96173e18356cb63554112cbfa3c1fb0a21204f0ddd86a4aee641ed0fc04d74c
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 10744 bytes
SHA-256: 252b509c8f0c61281cf10298be245d788e405d409bcf4af4716d603e5b5c1688

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