Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab8aecff70f61e9…

MALICIOUS

PDF

82.0 KB Created: 2021-02-28 17:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fdb7679ccb648860ac26757484974f5f SHA-1: 1ec721d671ad2923a0bbe28339e9a007112b232f SHA-256: 1ab8aecff70f61e9e8772288f85d4ae4f825d13dd89897800ba39d6746fead5c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and hosted PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=trimble+s6-series+manual PDF link annotation
    • http://trelon.fun/blockchain_backer_twitteronyx1.pdfIn PDF document text
    • http://iranomics.com/jutimugusexugasonjwvq.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/3678946.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/xifurararolus_rosolu_pivirot.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/jeep_cherokee_service_schedule_2014ik3xy.pdfIn PDF document text
    • http://futegejetebe.22web.org/let_it_be_piano_sheet_tutorial.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/3175102.pdfIn PDF document text
    • http://idclick.cash/how_to_change_battery_in_liftmaster_garage_door_opener_keypadhr5xz.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/4530647.pdfIn PDF document text
    • https://nukubutanedun.weebly.com/uploads/1/3/5/3/135309192/2399008.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/3cab4b35.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/24525050910.pdfIn PDF document text
    • https://badoxilorapa.weebly.com/uploads/1/3/5/3/135347885/vixavelofuzoropu.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/8277987.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/18281826747kvmw4.pdfIn PDF document text
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/barivo-gabomog-degavonefutuki-rotigefiku.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/e2211a6242c79.pdfIn PDF document text
    • http://pupofikavize.iblogger.org/6843872317.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/6571396.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/ripuseworomu_sudas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zetafilutebes.rf.gd/batman_and_psychology_travis_langley.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_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 5108 bytes
SHA-256: b5bbcac3ae6955404a8e523c3b7bde2c57e92806641977d744ccef33af39f4f4
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 12592 bytes
SHA-256: 7ab26a31dfa167af596cea163210cd54b917b1a69eecbce96dfd996da2b3ed90

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