Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3b04e5d845662f…

MALICIOUS

PDF

73.4 KB Created: 2021-02-20 21:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb4327d4cddb88beb15003a8d992aafe SHA-1: 1a471cb159e4e0c18495563b4bd5c77f39d82394 SHA-256: 6e3b04e5d845662f2a72da0bb58fd8ecd3bdea39bc8a5891b0f56c56d00df6c3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to potentially malicious domains, and the document body, though corrupted, suggests a lure related to search queries.

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://seumenha.ru/strik?utm_term=what+is+the+main+idea+of+the+poem+still+i+rise
    • http://guitar.su/vitavofeboseduwuvemmztn6.pdf
    • http://italystore.pro/7194465803426y3p.pdf
    • https://kopusinuzek.weebly.com/uploads/1/3/4/1/134131929/7718930.pdf
    • https://kiretadipul.weebly.com/uploads/1/3/4/0/134040802/8399259.pdf
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/8939301.pdf
    • http://alexsaf.ru/shibari_booksod1ov.pdf
    • http://c-advance.space/71148407949r6kcx.pdf
    • http://anarchymedya.com/reflection_mulan_piano_sheet_music7opl2.pdf
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/dukapixupaxateru.pdf
    • http://whalesqpa.fun/smash_bros_melee_iso_dolphinznrxc.pdf
    • http://swiss-family.space/college_football_national_championship_odds_las_vegasd69p7.pdf
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/4780674.pdf
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/xivosorej.pdf
    • http://kmplitka.shop/48187050918phi96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jasosuwer.epizy.com/3239150403.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_off0000e390.bin
89d2df0c891762df44a6b0b86a3bce9c95acb50d4cbdd515c09a32cfdf7b0116
pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 5292 bytes
font_01_sfnt_off0000f573.bin
3d111d951145b22d447ab81fbdd986e489fa2e6cbf2491a33e66a8914ea996e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10300 bytes