Malicious PDF — malware analysis report

Static analysis result for SHA-256 161673994acfa217…

MALICIOUS

PDF

108.4 KB Created: 2021-05-19 15:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f98cd9162738592d2d4c1cf61814ce95 SHA-1: dbd2bda2cb76f12b63cc8090160a1efd42636435 SHA-256: 161673994acfa217c62fcbe9762ea567ce6dba1f650dab4c5facf58cb3b4f2be
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains a high-severity heuristic indicating it's an SEO redirector for phishing. The embedded URL, https://nipisod.ru/strik?utm_term=is+android+more+durable+than+iphone, is the primary indicator of this phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lure users to this malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=is+android+more+durable+than+iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ff57cce9018f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_602b709abbf28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450511/normal_604186be75eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_6069ecf3cd7cf.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
    • https://s3.amazonaws.com/sitozi/sbrs_funtua_application_form_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d0c48e-788a-43fe-91e9-172e1663d764/2002_buick_century_limited_oil_type.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/how_to_reset_rinnai_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/jotumaxajitewijatususol.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/94435824742.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/zokenijut.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/mandolin_exercises_for_dummies_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/51384229780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4092a5-cc67-48e0-8143-7d76bfef08a4/fijarituwimedafiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/hashar_full_movie_hd_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/what_are_ethical_issues_in_clinical_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/rewiniximekover.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/domevolurezubafezigu.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/78118399212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff01f74-01d2-4239-9978-6d42a0db7192/xovetujutikivafegakiwose.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/josexaxagutifa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16040 5160 bytes
SHA-256: 969b24a958aea3897b293a8c995e8eb407be1679e9ba78ef0871674edb03d13e
font_01_sfnt_off00017184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17184 10588 bytes
SHA-256: 9e2ab9cacddf5bc0c3919a4d1a795e08a6b5047adb7aca0829a2846ed5b84fea
font_02_sfnt_off0001958a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1958A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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