Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22502620db48630…

MALICIOUS

PDF

60.8 KB Created: 2020-12-16 20:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3d2aa07531782b54fcf38d0d4b92b4e3 SHA-1: b001dc73d17b936e3be3cb8a333e2b0fd6630855 SHA-256: f22502620db48630ad055f3ae3c324ba2370ec94051eb527c26bf90403720271
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary URL points to a domain associated with malicious activity, and the document body, though heavily obfuscated, contains references to 'chapter 9 section 3 cell cycle regulation worksheet answers', suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=chapter+9+section+3+cell+cycle+regulation+worksheet+answers PDF link annotation
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/d8d55f70d45e5.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/jalipedaz.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/8214455.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/zibutifipexaji.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/3118adc7-ff67-4053-8eef-bb39e97da505/16789848887.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/33970096171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96c7180-7268-45b3-b403-572be0b6989c/80701086935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0b3b37-5d9e-402c-b5ca-32fc96706fd8/nowofusezanot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bce607-57c9-469a-8074-26be48ba4b75/81149216102.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/subject_pronoun_verb_agreement_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7537a4b2-e0b4-4cb8-8c32-5267e6b33889/europe_climate_zones_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/fefomamunavaxodedixun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a391dca5-7edf-4a6b-989a-46744f35467c/kevin_costner_baseball_movies_bull_durham.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 5680 bytes
SHA-256: 59b24e826093cd50b53ddcc35b05b914ca3ce4982935cde61fda99679711e50e
font_01_sfnt_off0000c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59E 9388 bytes
SHA-256: dc3ae0bac869abd3e0194004d1a42808beb1f7e2c4958f202ec558404fc61de2

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