Malicious PDF — malware analysis report

Static analysis result for SHA-256 4543fb0ca99a2efe…

MALICIOUS

PDF

72.4 KB Created: 2021-06-10 14:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf44086e17f3d39306e35b6984c324e6 SHA-1: 81199d01d33fd4f689db891c6f5d08c3780be589 SHA-256: 4543fb0ca99a2efe8d6f2ba15745daf1109ea8943a42a9999120dc9781fd1f4a
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The primary URL, 'https://smidgel.ru/pbw?utm_term=best+control+settings+for+pubg+mobile+3+fingers', is presented as a guide for PUBG mobile settings, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

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://smidgel.ru/pbw?utm_term=best+control+settings+for+pubg+mobile+3+fingers
    • https://cdn-cms.f-static.net/uploads/4452618/normal_602eab33b5e73.pdf
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/658052.pdf
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/bebbb.pdf
    • https://cdn-cms.f-static.net/uploads/4423427/normal_6052faf68d2fa.pdf
    • https://cdn-cms.f-static.net/uploads/4422368/normal_604cf0a1989f4.pdf
    • https://jajamavufivaz.weebly.com/uploads/1/3/4/2/134235884/9f42d5553.pdf
    • https://cdn-cms.f-static.net/uploads/4408873/normal_604838fadf5aa.pdf
    • https://fevokokedu.weebly.com/uploads/1/3/4/5/134500062/4451275.pdf
    • https://lonojoxojiliw.weebly.com/uploads/1/3/1/4/131438577/xoxopufo.pdf
    • https://cdn-cms.f-static.net/uploads/4455673/normal_6046800776297.pdf
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/ganozemiwidatow_zowaroti.pdf
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/pufir-wugin.pdf
    • https://cdn-cms.f-static.net/uploads/4453730/normal_60171b4a461b1.pdf
    • https://cdn-cms.f-static.net/uploads/4470543/normal_6043f2af69a28.pdf
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/fibil_poxaxusituxobof.pdf
    • https://rawadawopi.weebly.com/uploads/1/3/0/8/130874142/wotosezafafefewefa.pdf
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/07d94b4fd.pdf
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/xaxusovases_dulogivovi_jelusimuv.pdf
    • https://cdn-cms.f-static.net/uploads/4416921/normal_606a94b58c4f2.pdf
    • https://xakepimefinawam.weebly.com/uploads/1/3/4/9/134903333/zumozegogewo.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_off0000dbdd.bin
a3c64b793e267a7281da095de3bd188fcca72068b5be64ebbe877a5eb4464940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 5480 bytes
font_01_sfnt_off0000ee76.bin
5b61504e024ace509a784d84d3fc85a72caf88a47c6b01606db0a868209a68e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 11000 bytes

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