Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbb3540cd6758fe…

MALICIOUS

PDF

87.9 KB Created: 2021-01-09 14:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e21718ac0a0093aabaacbfcc0256286f SHA-1: 66e319e33bf5e43352a40c6210cbe9a50ebb9523 SHA-256: 7cbb3540cd6758fefdee3997a835d9c7426acf659349d560743b535016d17a2e
304 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains numerous links to external sites, many of which are hosted on disposable domains, indicating a link farm for SEO manipulation or traffic redirection. The presence of a brand impersonation heuristic for Microsoft and a link to a known malicious redirector strongly suggests a credential phishing attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lure users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.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.
  • 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://traffmen.ru/123?utm_term=death+of+a+salesman+secret+quotes In PDF document text
    • https://cdn.sqhk.co/potiribuwuf/gdJwXrp/6269387370.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.pdfIn PDF document text
    • https://lurovexizapup.weebly.com/uploads/1/3/4/4/134402553/xolojegumomofedeb.pdfIn PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/mirowatudawabemunuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_5fb2ae533123b.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/280b3.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/2fd861bed437a5.pdfIn PDF document text
    • https://nimitokusewifoj.weebly.com/uploads/1/3/4/6/134647116/2627597.pdfIn PDF document text
    • https://kigovedinefetup.weebly.com/uploads/1/3/1/3/131384362/xowaz-memakojeba-diwusugoluzowe.pdfIn PDF document text
    • https://fexejazawipezes.weebly.com/uploads/1/3/4/8/134869354/rinewapanunik-xalozok-durevol-zojobalok.pdfIn PDF document text
    • https://xuwajaxupix.weebly.com/uploads/1/3/1/4/131407635/6dcdbbd5f9eaa0.pdfIn PDF document text
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/e090f4ac41bd.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/iicBjj8/how_to_decorate_a_cake_at_home_easy.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/3dc66260-8129-4562-831a-52e7dea5f0fd/tazatiso.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012cc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CC1 21036 bytes
SHA-256: 842e796ed149ba5fc4bc3ad3017c338a9ddcd1c7822ae6ca8aeae3abe65e7a58
font_00_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 3012 bytes
SHA-256: 9f4b9a9fcd4a7fd0527f4694b63b992009dd0bd78dc606659ad1eebee4df53ff
font_01_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 5244 bytes
SHA-256: 712774f58de16408be009fa2e41dae47b59d4254370f961fb75d2604951faafe
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 10376 bytes
SHA-256: 220d2635f1d209c4b28ebb6297e5eef2d7bed45ea478fcc92147535a50a104c0

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