PDF malware analysis — malicious · 3c1a28a135d6be56

MALICIOUS

PDF

78.7 KB Created: 2021-06-09 05:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 502fd41560b55ab9720a20ae9b62157e SHA-1: cb57edd035bfdc6648a8d274565d3d708b3af8a9 SHA-256: 3c1a28a135d6be56165d09a99a09254084d586cf6b311398091a20519e9f3de4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, with one prominent URL pointing to a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be part of a link farm, reinforcing the idea of a redirection or phishing scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 5

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://golowaki.ru/123?utm_term=5sos+piano+sheet+music+with+letters PDF link annotation
- https://static.s123-cdn-static.com/uploads/4426550/normal_5ff5de053ab94.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368466/normal_6034998870674.pdfIn PDF document text
- https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/gafevovonejofis.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412583/normal_60669b7f0e131.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4414336/normal_5ff76154c44f3.pdfIn PDF document text
- https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/sakuzexa.pdfIn PDF document text
- https://powedumino.weebly.com/uploads/1/3/4/3/134350182/subivi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379626/normal_60591b25d5be9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426425/normal_6043eb5b9da39.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408997/normal_602fb2818d965.pdfIn PDF document text
- https://rewuxumo.weebly.com/uploads/1/3/4/5/134586949/sabuna.pdfIn PDF document text
- https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/8d84a612f9e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427267/normal_60294d4361645.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://letonepamusi.pbworks.com/f/capitulo_2a_answers_2a-1.pdfIn PDF document text
- http://divogatupum.pbworks.com/f/84604790253.pdfIn PDF document text
- http://lulatigono.pbworks.com/f/tolenemofaleraxiliwab.pdfIn PDF document text
- http://kemulosomul.pbworks.com/w/file/fetch/144729753/macbeth_study_guide_questions_acts_1-5.pdfIn PDF document text
- http://negovijalulu.pbworks.com/f/ruvizavorebuda.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/739a6911-0187-42f6-ba4c-663b8679ddd8/are_g_shock_watches_good_quality.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6e881d27-856a-42a8-8dc6-4980808dd2e7/50163696591.pdfIn PDF document text
- http://pebokuvog.pbworks.com/w/file/fetch/144493731/96684038209.pdfIn PDF document text
- http://mituxap.pbworks.com/w/file/fetch/144423831/imtoo_video_converter_ultimate_free_download.pdfIn PDF document text
- http://kigiputilik.pbworks.com/f/bivapimawowulaj.pdfIn PDF document text
- http://divusoriwa.pbworks.com/w/file/fetch/144916539/promotion_ppt_template.pdfIn PDF document text
- http://zewalar.pbworks.com/f/4712766180.pdfIn 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f37e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF37E	5292 bytes
SHA-256: `eff5acb10b30396ca918686377d29605ceb3c5bfe592c723f7e38deaaf91f1f9`
`font_01_sfnt_off00010567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10567	12464 bytes
SHA-256: `37b2884aa2206039d08d1f2165f72bccc2f7302a1a1e442c763bfd7d7bf60ab5`

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