Malicious PDF — malware analysis report

Static analysis result for SHA-256 10defb28490ea272…

MALICIOUS

PDF

114.6 KB Created: 2020-12-09 10:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: caf092f0510fefc2cba4af18fbbfa261 SHA-1: 402f2699aaf24a90cf033aeea0b1f44d849bb41b SHA-256: 10defb28490ea272e963b221750a4ced2c1b0680d2a5886c453e84420fadb2c0
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary redirector URL pointing to a suspicious domain. Heuristics indicate this is a link farm and a potential SEO redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafficel.ru/strik?utm_term=convert+utm+to+lat+long+excel+formula PDF link annotation
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/gumasolab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://static1.squarespace.com/static/5fc529a5bd14ff0dd2b8563d/t/5fc7129ead3e6411923daab5/1606881950685/41034861969.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2740a2757459be2c9b8/t/5fc54fb29b1ed035388cddda/1606766517097/bodivewavidugur.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a252f9866f3fd2f4236e/t/5fcd403afe657040d59e8e7a/1607286842967/47325189685.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ebbeff13940aa24cd01f/t/5fcab55151120475abc73994/1607120209368/guardian_tales_3_100.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4db31972c46e3c952b4e/1606372788530/fourth_grade_fsa_writing_practice_prompts_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f91fa3bf4b14abc32683/t/5fc63c0cfa04221c71f42aab/1606827020382/shark_world_tap_pocket_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/78119287235.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc519b12bbd74065821ad2f/t/5fccd373d235d37878c48798/1607258999675/22727370205.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2ed17e7202640ea1bf0/t/5fc32bb0f3de5e49b5cbaf25/1606626225182/42055471527.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15681 5008 bytes
SHA-256: 5e7f9f924e855b7f4bc08aef4c118483400670d36ca180a2f3b2ea9abef634b2
font_01_sfnt_off00016781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16781 12336 bytes
SHA-256: 64e44605dcd1d3be38e256f4f4d46f3f8af22340c1d7796fe2a88b30f777f634
font_02_sfnt_off00019185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19185 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_03_sfnt_off00019f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F85 8852 bytes
SHA-256: 8f20087435154d42683b87c3b3708e68488ef59f11f4886f2f3210917d664ed7

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