Malicious PDF — malware analysis report

Static analysis result for SHA-256 a352368f21ebe8cc…

MALICIOUS

PDF

77.1 KB Created: 2021-04-16 05:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e23c0f635b5688992068c1fa792f1f77 SHA-1: d5fdebf3b45dba1fe26f2775553a56f90ca92658 SHA-256: a352368f21ebe8cca7a5908882006f2ebada4d1875f0ed5dba000a506d639a2e
186 Risk Score

Malware Insights

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

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 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://ponafet.ru/strik?utm_term=type+of+antennae+of+butterfly PDF link annotation
    • http://bathforlegs.xyz/games_strategies_and_decision_making_2nd_edition_by_joseph_harrington._worth_publisher4jmgg.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/ievjihJ/23835595383.pdfIn PDF document text
    • https://duwelivupegated.weebly.com/uploads/1/3/4/7/134711348/f33fb534fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/ICfjijj/cube_attain_pro_disc_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/jeibhh1/kuropuzusiba.pdfIn PDF document text
    • https://cdn.sqhk.co/livaxipovage/ciajbia/rosobegusanixobarevosubis.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/jgeNOex/bosatixalatoluxaxuxipipo.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/zabidudigovep.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/gdQqMgd/five_little_monster_jumping.pdfIn PDF document text
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/7736241.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/ePptkMz/86488277084.pdfIn PDF document text
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/pigulolunike.pdfIn PDF document text
    • http://pressit.fun/34694762421xzmpl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_ee71a1d94ebc40628e77ea2b53d431e6.pdf?index=trueIn PDF document text
    • http://bipaxoxibiva.rf.gd/abcd_movie_songs_free_in_telugu.pdfIn PDF document text
    • http://tiwadelir.rf.gd/fighting_fantasy_adventure_sheet_app.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_c11538cdb34b44e3be4c4435bd09c8f6.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_a5763bc0d46b4b8faf1d4c22acee4130.pdf?index=trueIn PDF document text
    • http://mebabafa.epizy.com/how_to_setup_my_hp_deskjet_f4580_wireless.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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 4908 bytes
SHA-256: 4550652e7673b4f9dde2b9ed9d385f057db3f739c81a0c7106a98768226b9d27
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10944 bytes
SHA-256: 3f60097b2e2d52c2a5f46e476d5b5f7a52ff4df73eee56328a6fa63ebcf25969

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