Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1b34f0a310713f…

MALICIOUS

PDF

77.7 KB Created: 2021-02-28 08:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 30c631259b3486093e6fe5e197e047c8 SHA-1: f49b7c2eb317a1922cfeccec21975bdf85c1fa45 SHA-256: 7d1b34f0a310713fd259e52027cfc6f9fe8eb2782a4247f050197c1aaf65ba99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/award?keyword=roadmaster+adventures+bike+review PDF link annotation
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/sufogijamakazememe.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/cgiieia/1v1_street_basketball_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/h0ggsjE/bijif.pdfIn PDF document text
    • https://jawenovexexadu.weebly.com/uploads/1/3/4/0/134012785/3605316.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/kopizevilateju-nizatupifesuraf-loxela.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/Cjchbia/48328724439.pdfIn PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/a495091a.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/7348667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494888/normal_5fddcfc36c9ca.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/fhgYgfj/online_dating_catfish.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/sizijokonuxud-guxazubowun.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/N2ijYZe/busobusowofafidulozapuba.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/NCihxgg/consulting_interview_math_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/jdcq1RP/zombieville_usa_2_apk_happymod.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/xeteludiv.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/c5dORqF/refibaso.pdfIn PDF document text
    • http://usesol.xyz/30210472342f7nxn.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/hcHc0Nr/lucky_day_win_real_money_app_for_iphone.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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 5300 bytes
SHA-256: bd606ba3207012f5d380ff990356fce2a60f8c67a44674841e3f377b856234be
font_01_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10692 bytes
SHA-256: eb37a40744a23916a69f47cd0a3e4d1971048c229dd6f7f55ce334747f9d4838

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