Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fc98871f4cc2e4…

MALICIOUS

PDF

81.8 KB Created: 2021-05-29 22:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78d0511ba3d0353ae1ce1b1fc1c79622 SHA-1: 730b212ae52f6724db4621d4c7977e3848ba5a6c SHA-256: 47fc98871f4cc2e4bffb364240a0e5cc015c1b69342686f3a41f7ae2eb994a1e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may leverage embedded JavaScript for redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=reading+a+metric+ruler+worksheet+pdf
    • https://solupufaposedi.weebly.com/uploads/1/3/1/8/131857421/toxan-fizumupunefejo-gopajafusidi.pdf
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/8910000.pdf
    • https://geputugu.weebly.com/uploads/1/3/5/3/135311163/3f6cf83a9.pdf
    • https://cdn-cms.f-static.net/uploads/4411511/normal_60356d384e8b2.pdf
    • https://cdn-cms.f-static.net/uploads/4393016/normal_6060565530fca.pdf
    • https://wowajonaj.weebly.com/uploads/1/3/4/7/134717857/573748.pdf
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/792848.pdf
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/romode.pdf
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/f5c0a612.pdf
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/zovowa-kiwetivoxebek-soxat.pdf
    • https://gibotekiwifij.weebly.com/uploads/1/3/4/4/134444926/sidewefatas-vojiradajixipoz-deluw-watapes.pdf
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5ff9a611035f7.pdf
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/venazurizuwaf_vujoruvem.pdf
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/6314350.pdf
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/besemerulejav.pdf
    • https://ladipepisosixas.weebly.com/uploads/1/3/4/8/134898905/746102.pdf
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/3398009.pdf
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/72f95fc.pdf
    • https://wezusewowanura.weebly.com/uploads/1/3/4/2/134235680/visarugabisif_nijafewek_mogado.pdf
    • https://wojawuminusevob.weebly.com/uploads/1/3/4/6/134694879/1122330.pdf
    • https://mawurimi.weebly.com/uploads/1/3/4/6/134661678/5c3369.pdf
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5fee051b36001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000101eb.bin
bc202ca29c68e05a8639ced8e86f9bfa5c37b1da96a8c5d8d04f00fa663ec1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 5732 bytes
font_01_sfnt_off00011560.bin
2a2bbf8f1b4a10713db225cc4839eeb969b90f663aca9ab66172e657e5d03e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 10680 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.