Malicious PDF — malware analysis report

Static analysis result for SHA-256 898a564a6282f955…

MALICIOUS

PDF

87.1 KB Created: 2021-02-28 20:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a676c3bf59e6362866aaef5364aba0a6 SHA-1: db3d9d72aa7b3df9b39a04a16d5e53fb4da0d095 SHA-256: 898a564a6282f955a2a25aa8f2e59b8809cd998272d83c446782b5347c289d7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The document body is heavily obfuscated but appears to be a lure related to a popular book title. The presence of ClamAV and ML heuristic firings strongly suggests malicious intent, likely for phishing or distributing further malware via the link farm.

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://bologen.ru/123?utm_term=percy+jackson+lightning+thief+book+chapter+5 PDF link annotation
    • https://cdn.sqhk.co/zanuvajebodu/8jiU4Ls/fox_bet_super_6_app_presidential_debate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fc5ea2f2fda2.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/8986968.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/TAVGggG/puviledig.pdfIn PDF document text
    • https://jinafoxibufesow.weebly.com/uploads/1/3/5/2/135293268/mumutisexukaninewin.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/6gcibja/line_paint_sprayer_rental.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/iiskNk1/space_flight_simulator_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/3iaghhj/john_cena_sound_button.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/bc37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd27f274462b.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/1W1013r/31060838248.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/ghgfjcW/12_ardrossan_loop_kingsley.pdfIn PDF document text
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/numizebafuti.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/ie0NgfV/anger_of_stick_5_level_100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd28a064c2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_603924186688a.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/cejjbja/cw_the_100_season_7_release_date.pdfIn PDF document text
    • https://vedatirujoxe.weebly.com/uploads/1/3/1/6/131606280/nikibasedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/dosafokun.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/travel_reimbursement_template.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.

FilenameKindSourceSize
font_00_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 5784 bytes
SHA-256: 1b49ebc368f14e1599b268a70111b0f45fc9817ab07f61bda11c8b1cc8324321
font_01_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10220 bytes
SHA-256: 69026286a026742d1a90f3ca2cf1b70208f80db143e43a88b10fbc021532ecad

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