Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a1d77906cb7450…

MALICIOUS

PDF

84.0 KB Created: 2021-03-07 16:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5787235257db5599b3aa0d5384cefe8b SHA-1: 249ec38980ebf420c838bf1708bd7ffca489df95 SHA-256: 13a1d77906cb74509181a764063e1220cf8bda73a6aaec41249b65a803a032c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/strik?utm_term=stihl+fsa+56+11+battery+string+trimmer PDF link annotation
    • http://groshyk.site/8271929640dzpvl.pdfIn PDF document text
    • https://cdn.sqhk.co/faruvate/2jhuugd/schema_electrique_2_lumiere_1_interrupteur.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/hWPifyH/54459063442.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/id3TibE/pbs_video_secrets_of_the_dead.pdfIn PDF document text
    • http://exampl1214.com/ford_windstar_2003_battery9gbqv.pdfIn PDF document text
    • http://wiinorama.space/dalopatufaxusrqk4d.pdfIn PDF document text
    • http://all-system7.xyz/junulapvr0y.pdfIn PDF document text
    • https://cdn.sqhk.co/limexofure/fhegjge/twisting_frog_jumps_exercise.pdfIn PDF document text
    • http://artrosil.xyz/assistant_sales_manager_job_description_resume5ee5b.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/hajgifs/30994663872.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/jNiiY01/ava_lockscreen_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_5fd5f424b5b00.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/187859774559fppg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459780/normal_6002994b3f14b.pdfIn PDF document text
    • http://rusakova.space/kekidumafuro1nfu.pdfIn PDF document text
    • http://kushtanash.ru/smart_manager_apk_for_samsungqqmpp.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/i3LTdjg/nasazeveju.pdfIn PDF document text
    • http://copyrighthelpcentral.com/9285609608mlxtx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mejobu/595942738.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/71725190542.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 5536 bytes
SHA-256: 180cc2f38b459c728197778164f2dfa8aaefd11ee33fb2e4072a733800118685
font_01_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 11308 bytes
SHA-256: 80cae1bc40f4a859719cbfc22ee42369edc1bb17bb9867eacac1f05bb84a3a5a
font_02_sfnt_off00013406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13406 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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