Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3c410aa2f9a2a8…

MALICIOUS

PDF

80.2 KB Created: 2021-04-01 17:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: acba70d572b2c95045090a1f4f67fb0d SHA-1: ef9390f32bfda909e7d899a00bb0bf8aaa920ae6 SHA-256: 7d3c410aa2f9a2a8c3c3aa46ebd68e97e095cff7c16cf5f3efab60acf4d4dcdc
126 Risk Score

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://gimoguvi.ru/123?utm_term=annelids+1.+107+mod+apk PDF link annotation
    • http://copyrightsupporthelpcenter.com/channel_logo_freeal0ex.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/wogj356/weird_facts_about_the_world_war_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/daGhhRY/let_s_learn_how_to_draw_app.pdfIn PDF document text
    • http://zoosalon.org/pibedopivokafofubeloriemu1a.pdfIn PDF document text
    • http://italia-doc.fun/data_analysis_using_stata_download1v4jl.pdfIn PDF document text
    • http://garant-ritual.online/rc_warbirds_rtf6kl3q.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/bWxI0gd/clash_of_the_olympians_hacked.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/ca_vishal_bhattad_booster.pdfIn PDF document text
    • http://wildber.store/how_to_find_starbucks_work_schedulemyyed.pdfIn PDF document text
    • http://grantmedica.ru/70456047506ryq5u.pdfIn PDF document text
    • http://inscarusa.info/kipunekorwaonz.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/70071980939.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/5687068.pdfIn PDF document text
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/d35e7e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifazudiso.rf.gd/casio_f-91w_watch_strap.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/maplestory_angelic_buster_skill_guide.pdfIn PDF document text
    • http://zokitidekav.epizy.com/regibomowigasopok.pdfIn PDF document text
    • http://sewegijod.rf.gd/bawefifurorimuluta.pdfIn PDF document text
    • http://kevatudoritek.rf.gd/gexilefezu.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/plenty_of_room_at_the_bottom.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
    • https://play.google.com/store/apps/detIn 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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 5368 bytes
SHA-256: f7fbd9a4739ad1a8cd0cb5f94b1ff3f77069c9340b4a43e9d29d924be0984ce8
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 16116 bytes
SHA-256: 80cfea0bc191df0977d665316790f54668736066339ca2d7ddb66f149948aa0f

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