Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12145a29d1ee7ca…

MALICIOUS

PDF

62.7 KB Created: 2020-11-14 20:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 38cd7cb48c9850e45430db8e036e2e19 SHA-1: 97fabbff61f01e928f8073b7882530f3d5421a76 SHA-256: a12145a29d1ee7ca2cb8dfcaf9205f28af76ead24316d25b3fcdbcc59a46a38e
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains or known redirector infrastructure. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the primary purpose is to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

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
  • 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.
  • 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/strik?utm_term=diccionario+de+latin+vox+ilustrado+usado+precio In PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/68318e53a.pdfIn PDF document text
    • https://zojokoladateru.weebly.com/uploads/1/3/4/4/134497877/xanotazuzevus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f909c90868b7.pdfIn PDF document text
    • https://nixoferijoxe.weebly.com/uploads/1/3/4/3/134373865/zaxixitolodigewopu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/godekux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5faef7831ec2a.pdfIn PDF document text
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/f2158.pdfIn PDF document text
    • https://wekijoborumotis.weebly.com/uploads/1/3/4/4/134484899/5425574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5f9803dc8ea34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5fa00adce0af0.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/lusegokaves/40020411905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefe88b4-aace-469a-b725-4d5aeeb61f41/bafevotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9124c572-63bb-48d6-9964-a261f863dc49/estructura_del_texto_informativo.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/79482467110.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/92162572810.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_off0000b79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 5192 bytes
SHA-256: 63789eb652d481b1a13f1863ce6338801990dc5a25a7ba86ffd3fdece03eb488
font_01_sfnt_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 10624 bytes
SHA-256: ab09b422d3fd61e40dbca7b583be7384c95bcd9204e8be2ad051e80d4fa2c677

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