Malicious PDF — malware analysis report

Static analysis result for SHA-256 65548cbbc9092571…

MALICIOUS

PDF

72.2 KB Created: 2021-02-15 17:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c5272447110f7bf5e0928b05514b3e SHA-1: 7d7dad6829200d41e5f86f06c779bf3eb57288dd SHA-256: 65548cbbc909257186b1a2dbe2a1a8bbf93b6f7b7466301b3274d168cb7480ed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as legitimate documents or search results, indicating a link farm or SEO poisoning tactic. 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 embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://maypoin.ru/wix?keyword=conditional+logistic+regression+horse+racing
    • https://cdn.sqhk.co/silinetufid/jYAlmhb/78863530561.pdf
    • https://cdn.sqhk.co/wixakulu/ij0Kljj/science_textbook_class_9_ncert.pdf
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5ff8d9c6e4ab6.pdf
    • https://cdn.sqhk.co/gijesali/gibMg3v/urgent_care_sunrise_highway_sayville.pdf
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fc8760a91344.pdf
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5feb19de3476e.pdf
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/xalelivotepumejole.pdf
    • https://cdn-cms.f-static.net/uploads/4404964/normal_5fdae51a32477.pdf
    • https://static.s123-cdn-static.com/uploads/4465263/normal_5fe4f7acbd5fa.pdf
    • https://static.s123-cdn-static.com/uploads/4452593/normal_5fcb44a8dcb41.pdf
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/zegofe.pdf
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/f3e74d01.pdf
    • https://cdn.sqhk.co/menidume/jahhqql/bosafox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xilibosukotijob.epizy.com/empire_total_war_grand_campaign_guide.pdf
    • https://s3.amazonaws.com/folexapurilowe/97487077619.pdf
    • https://s3.amazonaws.com/zuguvoxoki/apgenco_ae_syllabus_for_eee.pdf
    • http://woruzuxolalov.rf.gd/android_kindle_app_text_to_voice.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_off0000df2f.bin
f2810c4b6a0c1606ebb61417d00b14c6adbbaddf029dab6521771f94ec6ec635
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 5104 bytes
font_01_sfnt_off0000f07e.bin
e2ae492a2b04daadae6be3e8dc189a578596ad0e0125a885442b74bf1026c7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 10208 bytes