Malicious PDF — malware analysis report

Static analysis result for SHA-256 183916758970cc79…

MALICIOUS

PDF

79.8 KB Created: 2021-04-28 05:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff31a6cbff99964bfcf4603c7dbf5847 SHA-1: 0cd22fb6501cdb6d620eacdd97ad489210d262db SHA-256: 183916758970cc79c289f246d7512cb06d173b1399c15f6b82d9a7bed0084b5b
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 0.9993

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/strik?utm_term=dsc+user+manual PDF link annotation
    • http://form-lnstagramverificationbadge.com/toro_timecutter_ss5000_drive_belt_routingxguoi.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/zuzekulotunul.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/nosukerowaj.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/muzositoba_tizisukumowevu_tijutatevudap.pdfIn PDF document text
    • http://ketotreno.buzz/10270501216g9a6m.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/futurupevifadoma.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/f5841.pdfIn PDF document text
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/6901708.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/18f5c1a97.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/british_airways_inflight_magazine.pdfIn PDF document text
    • http://milansit.space/68484271522zv7h3.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/aqualung_tab.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/39032620868.pdfIn PDF document text
    • http://kusufuxufatup.getenjoyment.net/86733047902.pdfIn PDF document text
    • http://gutibefatidag.medianewsonline.com/62135683386.pdfIn PDF document text
    • https://fematebe.weebly.com/uploads/1/3/1/6/131607019/teviwitu-jafuduva-xepadoxafib-dasutivebavugax.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/btec_level_3_construction_and_the_built_environment_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivimufe.atwebpages.com/cost_structure_fashion_industry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f23e50-d591-4969-aada-23fb9bcd8c18/pre_calculus_12_textbook_pearson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62859a77-24fd-44c6-9ec5-73a27c785f90/classification_of_antibiotics_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9310cd6-b0dc-46f4-b4c0-3010f2e91291/vaziranobetilafafugav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7876c983-f8b7-4d2d-b699-916e9db55869/mawitekobawozilajubeni.pdfIn PDF document text
    • http://lavisekenesavof.myartsonline.com/estrous_cycle_in_humans.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_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 4944 bytes
SHA-256: 42a34bfbab6ccd197ea1ca76fd0865d2ac445decd9241d7a01d8b28851b2f338
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10984 bytes
SHA-256: c33e9f5bb0db260e3bf00270e9b4aed1e3dac621c4f340ab37b12875507ecc3e