Malicious PDF — malware analysis report

Static analysis result for SHA-256 c228bc2d8f7c01a0…

MALICIOUS

PDF

69.1 KB Created: 2021-02-08 09:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f197a3a9baf3ed1f780729d98af1110b SHA-1: 4500bb1d66defc60d6caa03511ad166098beb5e1 SHA-256: c228bc2d8f7c01a0cba97d864f90c52301435e016f2dbb0e0fc10c9c526cf5fb
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a site offering a modified version of the Angry Birds 2 game, likely a lure for malware or unwanted software. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for such links. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=angry+birds+2+apk+mod+latest+version PDF link annotation
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/1101937.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/dRibhfV/microsoft_sharepoint_online_backup.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/tiaacr6/dumunofifipukow.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/gibggha/vefezopexoxinojozovibinip.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/bEhbpUX/80246956961.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/ggijkjf/hacker_s_keyboard_apk_mediaf_re.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/FCjaezu/jafaxetu.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/3b006.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/rirusozo/hotterdog_jumper_size_guide.pdfIn PDF document text
    • http://mirepili.epizy.com/email_format_for_wedding_leave.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/toms_platform_alpargata_bloom_suede.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/market_leader_upper_intermediate_revision_answer_key.pdfIn PDF document text
    • http://mapureju.epizy.com/android_studio_force_gradle_update.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/diteleradobufuzawof.pdfIn PDF document text
    • http://muweluboxakok.rf.gd/2793548493.pdfIn PDF document text
    • http://muduwabu.rf.gd/98552234766.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/zupepetise.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/wuwasasobogaxuwovoba.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_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 5764 bytes
SHA-256: bb1923c888e9c477e1a9ae8b7b0aa96fdc58ea939e13006375aa331191bc23fa
font_01_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 10000 bytes
SHA-256: 9dc75e6245863fe0fee239b8bd96a107faf2549f39003f326cfed1d5df11ca9b

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