Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2c557ddfcf7659…

MALICIOUS

PDF

71.4 KB Created: 2020-11-28 09:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ccbdfb5c09532935eb16d24203812e9 SHA-1: be17a0f0ac4a8bdf5384f965433f09efad003374 SHA-256: bb2c557ddfcf7659d27e3175f8b265850576d5953ca6b78cfb4e5f813bb8a814
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on link farms or potentially malicious domains, indicating a phishing or content-scraping attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=cisco+ise+sns-+3595-+k9+datasheet
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f8e326547c3b.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/caa37072cf.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/144421c92d.pdf
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5fa781c600035.pdf
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f8fad71c937c.pdf
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/rufup.pdf
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5f8c2c9c46098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nigimul/finupiwevinerokowisu.pdf
    • https://s3.amazonaws.com/zubuwujoxom/gixakusesoxexozozajoxi.pdf
    • https://uploads.strikinglycdn.com/files/449a6fa3-604a-455c-8843-21b09515543c/anger_of_stick_4_mod_apk_offline_unlimited_money.pdf
    • https://s3.amazonaws.com/zerepuzuze/jajixipusopoledopopitu.pdf
    • https://uploads.strikinglycdn.com/files/81d17e43-4ca7-4224-b45b-785bb25d757b/mijozabowizozezonififana.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_off0000c89d.bin
16994c30e8e34972e3889073df2d4c6b8205a0ca6900e1bd308607d95a427e66
pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 5252 bytes
font_01_sfnt_off0000da70.bin
8dfe2d837bab7e27dc21f8fab7ce3b4209c982cdb1fa4acc4c1c0fe32f6fa632
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 11816 bytes
font_02_sfnt_off00010097.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 4324 bytes