Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ca66654027cf53…

MALICIOUS

PDF

73.1 KB Created: 2021-01-09 03:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3abe3ee430bce86eb1d3ad48724b28a8 SHA-1: ea60fc69049d39d063f43238fa942857c759ab8c SHA-256: b9ca66654027cf53f5d1fe702afe580de3533a467ea3c1f943beccce9dbe0aea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though corrupted, suggests a lure related to a 'Nokia lumia 822 manual'. The presence of embedded URLs and the link farm heuristic indicate an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

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/123?utm_term=nokia+lumia+822+manual
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5fd3b94f3c3d8.pdf
    • https://cdn.sqhk.co/wudawagirus/vgjjjhB/58943040500.pdf
    • https://static.s123-cdn-static.com/uploads/4385214/normal_5fcf2832b60cb.pdf
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5fa6b1850fcf3.pdf
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/sobuzi.pdf
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5ff215380d285.pdf
    • https://cdn-cms.f-static.net/uploads/4427086/normal_5f9cc258d6e67.pdf
    • https://cdn.sqhk.co/biposuba/jf8hbJc/drywall_mudding_price.pdf
    • https://cdn-cms.f-static.net/uploads/4376609/normal_5fa495644434e.pdf
    • https://cdn.sqhk.co/wamitavixitu/fVhaPhi/dungeon_quest_excalibur.pdf
    • https://static.s123-cdn-static.com/uploads/4468274/normal_5fdf47623630c.pdf
    • https://cdn.sqhk.co/fuwifemi/jciekjd/nixegawuzavo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/subud/ncert_maths_book_class_8_solutions_download.pdf
    • https://s3.amazonaws.com/xedewofuretujo/90977451962.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_off0000e0ff.bin
def650729c3798fcae3736cac63dc88c390c2bbb2ad156f20eeee50c82bebe8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 4916 bytes
font_01_sfnt_off0000f1b0.bin
2526ab1e0b0ad329a09d3be2406597fa84c8e302a33426d9c1873addd513b0fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 11588 bytes