Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2c1c79d53b7852…

MALICIOUS

PDF

111.9 KB Created: 2021-04-02 13:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 79b748161bbb3f73a23b8f3a12dcd26f SHA-1: 2341fa1f36bbb5c6b47db2d1a927a2a1592cc9a7 SHA-256: 9d2c1c79d53b785287a57feeab7f1959ca33d3ecf16f1f50d3b5603065dd7d02
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains. The primary URL, 'https://gimoguvi.ru/strik?utm_term=doctor+sleep+sequel+to+the+shining', suggests a potential lure related to movie sequels, possibly to trick users into clicking through to malicious content. The presence of many external links on disposable hosting indicates a likely SEO manipulation or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=doctor+sleep+sequel+to+the+shining PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486763/normal_6041465d474cb.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/4313811d1f.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/dazegemikuful.pdfIn PDF document text
    • https://pujowuvorokom.weebly.com/uploads/1/3/5/3/135347933/wobizovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422912/normal_60022131c9ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_5fe92e4a83ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_60549d9dee558.pdfIn PDF document text
    • http://latencfsrt.space/paxadokisofedezedade1hisy.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/dosonep.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/545566.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/2998643fdb.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/haicNRQ/ludo_star_2_game_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fff10923ba66.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/c8de7.pdfIn PDF document text
    • http://balifruit.com/crime_and_punishment_study_guide91xje.pdfIn PDF document text
    • https://talonira.weebly.com/uploads/1/3/4/8/134895983/1066889.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/gkSEQOz/boomerang_channel_number_on_dish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_be15159c2de749c4ae8e445862cf4809.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_f417c851e7994a7f8248342074591259.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_1156a991a5174d3f92e7b62dfb367eb2.pdf?index=trueIn 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_off000175ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175AC 5112 bytes
SHA-256: b62c35fbb81ac9db15ea4f39f2999e314137a5d26f986dd0440734be69aaf5f7
font_01_sfnt_off00018712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18712 12260 bytes
SHA-256: 74980f493ab60711cc58306b6df79fe786636044bc4a2644dfb6829d28c643b1