Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e06ea7b32c95b4…

MALICIOUS

PDF

80.1 KB Created: 2021-04-19 20:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6b0e073cbea674abbd3392032c69c2 SHA-1: ddb8a7042d7de8c7d617f9a0b4d301400a3883ef SHA-256: 13e06ea7b32c95b47064f59f9cd7343a451e005ce00b6e1414d2e3271a4b5287
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=msi+h81m-p33+compatible+cpu
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/pasol.pdf
    • http://womenit.space/wizupolewujubemorp1wob.pdf
    • http://plusstore.pro/meaning_of_internal_combustion_engine_in_sinhalativg0.pdf
    • http://deutschebank-meine.com/853880537031yytk.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/d63d2c69.pdf
    • http://best-ital.fun/30166632379mzwxw.pdf
    • https://kovajokuluvemu.weebly.com/uploads/1/3/5/3/135335912/xadibuza.pdf
    • http://spindlndou.space/beginner_piano_sheet_music_with_lettersnjde5.pdf
    • https://budozawepolok.weebly.com/uploads/1/3/4/8/134852557/repewiduzupuxawiruto.pdf
    • https://tubonizuruzoxuk.weebly.com/uploads/1/3/0/9/130969435/97ac577449.pdf
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/xidobibegezewuk.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/gedinabej-fifipobetamomar-gavefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_e5055ad2eef2489ba63460241e4fd33c.pdf?index=true
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_d469a8232a044ee2b6d4d0158c1e11e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c21f6f15-8984-4f9b-ad34-2c16f12b5163/hard_reset_linksys_wrt120n.pdf
    • https://uploads.strikinglycdn.com/files/0d07b9e0-b28e-4ddb-96a6-e5d69822ab94/what_to_cook_for_dinner_tonight_vegetarian.pdf
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_6183814727014998958ec092d778abbf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ff75fe12-39d6-4369-bd3b-baad56084780/xubofisojodonezupabuvan.pdf
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_3484065057444f62b090dbd25a5ca169.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_70e2eacd349f4ed68d728c69df46322b.pdf?index=true
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_72d0b39ea40a4e13b6c7f96ff6d38480.pdf?index=true
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_328b1f0f09314cabaecfd5e7a57ef7be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83c155b7-2103-45d5-b075-959953528184/sentry_1610_safe_owners_manual.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_eba873c236ae43aa8399e12e1e923a93.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f768.bin
02401189a253691ea53b052ebd46125f46956d011bab81ea1f0b8bce419490ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 5664 bytes
font_01_sfnt_off00010a97.bin
b8292262d63b9af7279c3822ff6003befda57746400400605a50326a9dd6c0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 11776 bytes