Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bc2c1ee1a49d9a…

MALICIOUS

PDF

66.9 KB Created: 2020-12-18 04:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 733b8af8b472fe8b801893fa20186340 SHA-1: 199eca4c7d3ecab98617c530150f9e72aa132a6e SHA-256: 90bc2c1ee1a49d9a888e56547ac3ac03f0f5b0b64ea79d030aeebbdb1e1609a1
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 redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=bissell+proheat+2x+parts PDF link annotation
    • https://selimubujupaso.weebly.com/uploads/1/3/4/8/134847774/df17ce58.pdfIn PDF document text
    • https://datevapo.weebly.com/uploads/1/3/4/3/134338939/pupituj_zuvemo_nosemu_dufuxemun.pdfIn PDF document text
    • https://fupebabo.weebly.com/uploads/1/3/4/6/134601971/89a9514.pdfIn PDF document text
    • https://nafarusulewabol.weebly.com/uploads/1/3/4/5/134587722/garugijet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_5fa51dd98a104.pdfIn PDF document text
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/8463208.pdfIn PDF document text
    • https://baxojozejaxofo.weebly.com/uploads/1/3/4/5/134586757/7b000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc525d588c99b6d37c2e2ed/t/5fc9ba853ff94c207e07f44f/1607056005910/pusosunemajitukizutozofaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/30538237122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2289f7d-d1e5-4993-ae34-7755b1caf980/chapter_5_review_answers_social_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/syria_s_civil_war_explained_newsela_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/binge_eating_disorder_treatment.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 5156 bytes
SHA-256: 443758ed530273b1b29c935b794e94d79d856a5c0f4f8eb38b36c98da4a5b085
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 11208 bytes
SHA-256: cae15b123760a0624e8ecba1337cb6ba4d3593260f48f42c9350c41145b904df

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