Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88c970da9ed30f9…

MALICIOUS

PDF

68.2 KB Created: 2020-12-02 00:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 21b20df71b91897530ed5fda033a96c4 SHA-1: 3dffd5dbf9f31a71ac4bfe1a49c0c80eeb3a9fa7 SHA-256: f88c970da9ed30f9a30092780dc19426aa6ddb7094f299068cec5de7fe5ef5b4
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://traffnew.ru/123?utm_term=lifespan+of+a+spider+crickets', which is likely used to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to lead users to potentially harmful websites, aligning with phishing or malware distribution tactics.

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
  • 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://traffnew.ru/123?utm_term=lifespan+of+a+spider+crickets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456399/normal_5fa855cbe1f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_5fb723fa35234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_5fbbfef2f29b6.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/5567431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f8885a8cd6a7.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/xatojem/challenger_deep.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/cheap_formal_dresses_online_shopping.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/elton_john_yellow_brick_road_song_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/periodic_table_of_chemical_elements.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/cartella_colori_pantone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098691d6-aaf3-4bda-a746-b602891180da/narelovonabegetiweri.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/80794682394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b2cd3b-72d9-4998-85dd-42d04872a9a3/63654298904.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/rapid_tone_weight_loss_price.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/36271570161.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_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 5124 bytes
SHA-256: e03640de1426ff8a325230ec940cf693cd39c9e5356995869bd3ea90a820a588
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 10840 bytes
SHA-256: 7d06a9a8588d438d96f4f1eaf92148efb266e408110f927a3db1281d6c61bc0c

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