Malicious PDF — malware analysis report

Static analysis result for SHA-256 c202e7d73a7f7e28…

MALICIOUS

PDF

89.7 KB Created: 2021-03-16 00:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 97de288a0899878483d97b69934aec2a SHA-1: bd1352b48877f492e561080f48df4032c6863b6b SHA-256: c202e7d73a7f7e2871975628d9c59975688840d42f280ad8da55aeeb18e4717c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/123?utm_term=linking+verbs+helping+verbs+worksheets PDF link annotation
    • https://sugasukeni.weebly.com/uploads/1/3/4/8/134878852/linawitutef-dobojafik-niluwetifepaj-sanegepotogali.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/nisewamiluruxotamev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5ffc81029f0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_603e1683ae833.pdfIn PDF document text
    • http://my-favshope.online/286221491v16z5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_6034716b311ff.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/fomex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_6006e3e65e13b.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/86f431.pdfIn PDF document text
    • http://mon-fortuneo.best/gejimanuvafinkul8d.pdfIn PDF document text
    • https://nojezedefefowas.weebly.com/uploads/1/3/4/7/134762002/nabekodiputudiluwema.pdfIn PDF document text
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/zazebukajagezalakum.pdfIn PDF document text
    • https://bojomuse.weebly.com/uploads/1/3/4/4/134462584/fc39f59bb3e9fd.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/fikipi.pdfIn PDF document text
    • http://6gusevshop.website/r_type_3_gba_rome4ukh.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/3258107.pdfIn PDF document text
    • https://xonugovelixef.weebly.com/uploads/1/3/0/7/130739086/loxejov.pdfIn PDF document text
    • https://pofunowiri.weebly.com/uploads/1/3/3/9/133997400/4314582.pdfIn PDF document text
    • https://natuxebifenukud.weebly.com/uploads/1/3/1/3/131378868/venimipab.pdfIn PDF document text
    • http://50offstore.pro/1976814944jles0.pdfIn PDF document text
    • http://reduslimitalia-official.site/8577823891oe7nj.pdfIn PDF document text
    • http://educationonline.website/zenuzaxobupugixinevikp7tu4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 5168 bytes
SHA-256: 97225b0c65675fa58d30ca64d5eb1e67c7089cb06c10ca8232c1de689a0084e8
font_01_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 12720 bytes
SHA-256: cff2b325faa07de021c4a69b3b36a7769c5ff673dc7be3620c69b59f7ff96fae