Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7d52aaf2df0a2d…

MALICIOUS

PDF

76.5 KB Created: 2021-05-21 12:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cfdad6e8d5d348c453e015ab7a392dda SHA-1: 91b53805604442c0e8340d41f9e1805dffb1de93 SHA-256: aa7d52aaf2df0a2d72c9fd5ab0318be32808ae2d49da1451ca67c850bbbbc4a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=como+fazer+ser+humano+no+little+alchemy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466173/normal_605f9f5a09f47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458852/normal_5ff262df38e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_603eafab2406b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_604d23ba462e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_606d12655d1d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_6052db6238974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_602790bdab1c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421983/normal_5fce670dd5f6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_5fcfb6ef7443f.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/fefeludawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_603c279e5c9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fcba9b83d484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_606818169a595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5ff2d65bd59a3.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/315252.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/xajowu/31681909691.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/tukiwasi.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/audio_library_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49919632-e9fb-4b28-a1f7-d7e778cbda66/xujoxuzixufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/191ffcb8-77ec-47cc-9827-0b55ed93a449/free_video_games_to_play_online_without_downloading.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/42434944828.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/household_biogas_plant_design.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 5176 bytes
SHA-256: f28ed3e9dd080b372a7ab2766235979657a90d44a7810f13629285366d962ff4
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 12636 bytes
SHA-256: 0be12831193bc439c89e8c80e1f9b3920202c0c7fbe2363fdd9b0457d4deeb8e

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