Malicious PDF — malware analysis report

Static analysis result for SHA-256 339b1596bbcfac2e…

MALICIOUS

PDF

77.9 KB Created: 2020-11-25 00:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3758fbc64a61e3d14175b8bd9defa2b SHA-1: 5c3f2b7f0c2521caa2cc2787236847093969fae0 SHA-256: 339b1596bbcfac2e1314ce2d82f0e33a40d579b5e06c78e5d1e6f0fd76f12695
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a phishing or SEO spam campaign. The embedded URL 'https://trafftec.ru/123?utm_term=bees+in+new+jersey+beach' and the Weebly link 'https://wilowepixamu.weebly.com/uploads/1/3/4/4/134476622/364c6.pdf' are key indicators of this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafftec.ru/123?utm_term=bees+in+new+jersey+beach
    • https://wilowepixamu.weebly.com/uploads/1/3/4/4/134476622/364c6.pdf
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8c573ba4d03.pdf
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5f919ee19b56e.pdf
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f94bbc1860f8.pdf
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/b94e1a.pdf
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fa5c26413e97.pdf
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5faf636c7555c.pdf
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f874ed2c130b.pdf
    • https://vazipetola.weebly.com/uploads/1/3/4/4/134493341/446c8737d2.pdf
    • https://xevaxeleputoli.weebly.com/uploads/1/3/0/7/130775823/941478.pdf
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f9dd4c86bc67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tetofamuxulil/b_a_full_form_in_marathi.pdf
    • https://s3.amazonaws.com/luropi/jopomaxulugimobo.pdf
    • https://s3.amazonaws.com/dovulavavo/how_to_make_a_group_on_roblox_2020.pdf
    • https://s3.amazonaws.com/wifukedot/sabki_baaratein_aayi_full_video_song.pdf
    • https://s3.amazonaws.com/pazovugal/cover_letter_for_phd_application_sample.pdf
    • https://s3.amazonaws.com/daxemo/yiruma_piano_sheet_easy.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_off0000f466.bin
178dbab96e07bcbf1795d3c17be7823870a6e7659d9e14d06d07861da4d62fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5312 bytes
font_01_sfnt_off0001068f.bin
6b2170fe01bc31c2ba1be54ddd8862bf9b5150d9a3e2de0c137928a945d9560d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 10524 bytes