Malicious PDF — malware analysis report

Static analysis result for SHA-256 5573fa2885d4ccae…

MALICIOUS

PDF

127.4 KB Created: 2020-12-24 12:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc6f60a45a801956a9861c3b959b9dd6 SHA-1: 30460352994b4d8091b520ec08cb762a2b959271 SHA-256: 5573fa2885d4ccaeb855af274654bfae460106c3a4afd10047ded0f8957f639c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a 'classification report' lure, likely to trick users into clicking malicious links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/aws?utm_term=classification+report+multilabel In PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/1e3f0e9dc6b68a.pdfIn PDF document text
    • https://rekenapun.weebly.com/uploads/1/3/4/8/134851377/taxomawubas-suselegefaji.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/dgigisl/kujutowe.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekata/jjNnasb/sugar_skull_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/Ejb3Ujc/bright_memory_app_download.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/muvomejugiwevipiw.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/Pjhbv5g/bubble_shooter_app_that_pays_money.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/nupagizinid.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/HggBqii/30518959234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/japolaveziwudividewuz.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/bimuxekupukebukuzot.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/taziwovixiboriwumewudunu.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/free_printable_colonial_america_worksheets.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_off0001b421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B421 5208 bytes
SHA-256: 13cd79ae24b5069819b3e60c73841dca800fc334ba612d5894650c0c3faddece
font_01_sfnt_off0001c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5B9 12624 bytes
SHA-256: ee133ed06affe298fbcecc1c45182495c8acdd69da62cf2648823c68486dfb43

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