Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4d9a12f7f77bfc…

MALICIOUS

PDF

69.8 KB Created: 2021-02-21 06:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ccb9613ed61f0c5d13cfc20feef94771 SHA-1: 1d07b1736a58ddf4416acc68529b07692843cd02 SHA-256: 7d4d9a12f7f77bfc3a4a701919a229a9b2614ed1c22ac706378eda79665da346
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to S3 buckets, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://jottigo.ru/aws?utm_term=how+to+change+the+time+on+a+norstar+m7310+phone', is identified as a redirector likely used for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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
  • 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://jottigo.ru/aws?utm_term=how+to+change+the+time+on+a+norstar+m7310+phone PDF link annotation
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/42cc5ea10.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/4396902.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/3949717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fee4e2f5cf5f.pdfIn PDF document text
    • http://babudategajuzul.iblogger.org/fejuxovoti.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/vokeri/51386392168.pdfIn PDF document text
    • http://rikirusekufipu.epizy.com/rimav.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/next_to_normal_natalie_audition_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/1186881285.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/58123058983.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/alternative_dispute_resolution_robeniol.pdfIn PDF document text
    • http://nareboveridur.epizy.com/catalytic_reforming_of_naphtha.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/cookie_run_ovenbreak_breakout_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/designated_survivor_season_1_episode_13.pdfIn PDF document text
    • http://kekabifaku.rf.gd/epic_sax_guy_sheet_music_tenor.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_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 5804 bytes
SHA-256: 2c92fcc63d69be575a78cacd4f7dc4a60fddc42f23a8eeb5a2920dd036d5ec6b
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 10212 bytes
SHA-256: 249d0f6796fe9fef4d06822bb5b3412c3db335382d49e2f1840bf8182849f80d

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