Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad38fccea21fcad…

MALICIOUS

PDF

58.1 KB Created: 2020-11-26 06:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69d29e62307f0d2cb7f0c3db5f4ff0f3 SHA-1: 52e1fc04917c9dbf2374604110965c0b61f35468 SHA-256: 4ad38fccea21fcadb08482d54719b404c7176b85efac8082fbcaa2615b319df0
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one pointing to a potentially malicious domain (traffine.ru), suggests a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates the document contains numerous external PDF links, likely to distribute malware or engage in SEO manipulation. While no scripts were extracted, the overall structure and heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=thermal+energy+worksheet
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/takizuzakelinivowiju.pdf
    • https://liburesaxus.weebly.com/uploads/1/3/4/3/134372769/rejaga-nagan-mubor-sataj.pdf
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/beb360fd6624e.pdf
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/1315635.pdf
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fa7311d3495d.pdf
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/3999766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisazabe/new_movies_2018_hollywood_hd.pdf
    • https://uploads.strikinglycdn.com/files/e69525d6-911f-46d6-84ba-bc6198838c4d/usa_wrestling_coaches_card_cost.pdf
    • https://s3.amazonaws.com/xukanomarexumu/godijumerifojudez.pdf
    • https://s3.amazonaws.com/davawina/twin_pregnancy_announcement_template_free.pdf
    • https://s3.amazonaws.com/dixaleko/mit_application_deadlines_2021.pdf
    • https://s3.amazonaws.com/lerezazo/prepositions_of_movement_worksheet_esl.pdf
    • https://s3.amazonaws.com/lanubili/zivalakosemuwimexoxizifir.pdf
    • https://s3.amazonaws.com/jenagubadopi/vidujevigopilasewogu.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/backtrack_apk_no_root.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa87.bin
ad4b04a8a340af42de7fc36b68ef00db4e1ae824d5df8724116d7ebd229d6453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA87 5308 bytes
font_01_sfnt_off0000bc7b.bin
c1fafb3e0b77f019f623c3ad0bb27654eebdf8398af4e7cfc32d57d22feb2e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 9164 bytes

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