Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8d066a51e14a71…

MALICIOUS

PDF

71.6 KB Created: 2020-12-14 20:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b0977d1bb1edbe24a0108fad4f688f5 SHA-1: d0a93cb9b3351646ff11f990ab42efaf66cea1ca SHA-256: cf8d066a51e14a71f336af5cbfea2b6c436b9660be66d0c9358b607984e10334
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 document contains a large number of external links, many pointing to striking.ly, suggesting a link farm or redirection mechanism. One of the embedded URLs, https://trafficel.ru/123?utm_term=lab+metric+measurement+datasheet+answers, is likely the primary malicious destination.

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://trafficel.ru/123?utm_term=lab+metric+measurement+datasheet+answers
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/6747635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/94935bf5-d4d2-47a1-a75a-48ad24f36a6d/22591290308.pdf
    • https://uploads.strikinglycdn.com/files/18d1f992-2dc1-46de-8cc4-f5b5e4cd7dfa/24373190735.pdf
    • https://uploads.strikinglycdn.com/files/25318578-6a4a-4f26-8c15-2adc8a7344c9/hacked_my_singing_monsters_apk.pdf
    • https://s3.amazonaws.com/pusori/73397932365.pdf
    • https://s3.amazonaws.com/zidenigad/xinile.pdf
    • https://uploads.strikinglycdn.com/files/e3e44aed-aed3-47ba-b9de-81fe25c9098a/39009893333.pdf
    • https://s3.amazonaws.com/muvemasoxaji/98252077787.pdf
    • https://uploads.strikinglycdn.com/files/3292f543-a0d1-4911-b403-de8112e38de3/rimoxuroxatowuboxabo.pdf
    • https://s3.amazonaws.com/felasorarabipis/brewster_law.pdf
    • https://s3.amazonaws.com/jasadavebaga/asthma_clinical_guidelines_australia.pdf
    • https://uploads.strikinglycdn.com/files/54a886e1-802e-432c-85ad-c66576e3f739/94865435741.pdf
    • https://uploads.strikinglycdn.com/files/e707266c-2817-4dbd-b897-8639ab44a9bd/9390550199.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd6.bin
549bbb76500397aea204ddf09d95ee0665e1e0cb993cf201648963ac35fed90d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 5092 bytes
font_01_sfnt_off0000df00.bin
526103831bac6d79c7a1648a62e358484e97c628ab35fdfd88b79de0476f9736
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10588 bytes
font_02_sfnt_off0001035f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 4324 bytes