Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc76ad9333a6e66…

MALICIOUS

PDF

80.8 KB Created: 2021-04-22 08:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5496ab03edf0be8733de08c6a45d7ad SHA-1: 7084c1d3b51db1583ad7b1f424c7212ecb7b9605 SHA-256: 3bc76ad9333a6e66777fa1323bcf5ec07319a025c69b91a9fa4d26c1a8d97012
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=best+rpg+tabletop+games PDF link annotation
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/vesigokon.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/niwuvix.pdfIn PDF document text
    • https://jafusakivamo.weebly.com/uploads/1/3/0/7/130739280/b09215e3d1b8a5c.pdfIn PDF document text
    • https://pizosamijuge.weebly.com/uploads/1/3/4/3/134348406/nudozoze-kugedapivilag-fazewufarabe.pdfIn PDF document text
    • https://nogimigupafex.weebly.com/uploads/1/3/4/4/134483996/vitusun_vowap.pdfIn PDF document text
    • https://fubaxegadajud.weebly.com/uploads/1/3/4/4/134454669/ff4dd735fea09e.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/pidesusozujifiragi.pdfIn PDF document text
    • https://zosevozosi.weebly.com/uploads/1/3/4/5/134527099/nebevomev.pdfIn PDF document text
    • http://jiviruke.iblogger.org/kizubowatexuwuxawelezem.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/banking_terms_abbreviations.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/how_to_reset_schlage_master_code.pdfIn PDF document text
    • http://xuwurexem.22web.org/75104683512.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/redijofikovapesadepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f45fc13-67d0-40e9-8034-c26eecdf7e56/8658376685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54d77ea-3fb6-4cd5-be5f-c436ca5a2517/jiduwajobuvuzikajuzuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7580b4-5be3-4c8b-bdc7-aef1eedd86d6/how_to_calculate_interest_on_late_deduction_of_tds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c49e5d6-2f75-4306-82b9-2c03d11621ce/86721598979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca64177-86d9-4aac-8eed-047cd9cbac5b/how_to_replace_samsung_galaxy_tab_4_10.1_battery.pdfIn PDF document text
    • http://sopidur.epizy.com/aws_certified_security_specialty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223050d5-0bf3-40eb-a88e-597c57515c10/30333123508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a78c043-d0fa-4697-b339-622b9db1b624/6775747681.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/ramifojugotireg.pdfIn PDF document text
    • http://zipifuxe.epizy.com/stihl_cordless_line_trimmer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efb19ce-ac6f-4145-a86c-68eccd29e4b7/how_does_nike_produce_its_products.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62b70d6-ac14-4d43-8a8b-fe90c58525f8/wisdom_for_mothers_book.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_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 5328 bytes
SHA-256: df919b159a9f14e8df4ac47dbbe039d70a78d6660a4918abafed4eba0f79b656
font_01_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 11224 bytes
SHA-256: a8f161fc81835d7df368d5ae7fd8fba6225b397c5abdba320baf4dd0515c7e78