Malicious PDF — malware analysis report

Static analysis result for SHA-256 e921f88487f83b81…

MALICIOUS

PDF

71.3 KB Created: 2021-04-22 05:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fa1bcc127bccc98ed2b22ad6c184216f SHA-1: 8259603656a3f5a522e2a2a168375327a206d332 SHA-256: e921f88487f83b811c1baafdf7f567465f4aee783ace418a33df6166d2ec89eb
206 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. It uses a callback-phone (TOAD) lure. 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 0.9995

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jumiwimov.ru/strik?utm_term=ranger+boats+hattiesburg PDF link annotation
    • https://cdn.sqhk.co/jedugifaxido/cPuhaEv/clownfish_voice_changer_sound_effects.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/4452744040.pdfIn PDF document text
    • https://cdn.sqhk.co/rabawula/e30R6YZ/vinozakezobadizagilika.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/shdZxfo/borimuvig.pdfIn PDF document text
    • https://cdn.sqhk.co/jadidawa/hhvecgh/68427790069.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/ftPCZaQ/animal_roadkill_statistics.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/joiiiii/37176683611.pdfIn PDF document text
    • http://ronojalad.22web.org/9767208726.pdfIn PDF document text
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/jepivaro-zotususurum-fopowojalex-natetobalo.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/wu_tang_american_saga_season_1_episode_8_watch_online.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/638f5b6e667607.pdfIn PDF document text
    • https://cdn.sqhk.co/rodoruwuwab/idsOgh9/janumesarodabum.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/ij9haie/torn_acl_and_meniscus_in_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/jlnicwd/lupido.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_cb4fb14d61914f96b0cbeade6b0dd56c.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_af98df3928274bf0846fa023dd3a0c2a.pdf?index=trueIn PDF document text
    • http://nowageg.onlinewebshop.net/nejodozumulonu.pdfIn PDF document text
    • http://futoriw.epizy.com/fuzavixapumogazim.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_70ec4d1ee93446e9b7e38cb925c165b4.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_675a3a8b7f844cd081d38888a9542205.pdf?index=trueIn PDF document text
    • http://tiguwafagez.rf.gd/kufikowidosuzajerad.pdfIn PDF document text
    • http://xipekewe.rf.gd/biosurfactant_production.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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 5064 bytes
SHA-256: dde4d846fc044a6e25950da46b9f02d5aadf8276bb83f5c37b22df9b34fbbc74
font_01_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 12328 bytes
SHA-256: 25e90e193377ec400b9369259aa5cb0b396625a0f3024ed727bd0927064e11f3