Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb21767e3180164…

MALICIOUS

PDF

80.6 KB Created: 2021-03-16 07:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fde57371ee1cc56e94e511eac90317a2 SHA-1: 9a83f9008464a4a95b6d95619c1e9c741e1ba561 SHA-256: ecb21767e31801642b1400caed0be61bddf5ec665718f544dbdb04db72ccf7cf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URL 'https://bologen.ru/123?utm_term=counter+strike+warzone++for+pc' indicates a lure related to popular games. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=counter+strike+warzone++for+pc PDF link annotation
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/getok.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/8876290.pdfIn PDF document text
    • https://vujanakisa.weebly.com/uploads/1/3/4/4/134401771/4242bad.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/wuligigepom-nojebepo.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/mewagumu_wezejok_dalefanu_viluwivifuses.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/tigidug.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/vupunakoperu.pdfIn PDF document text
    • https://pimowaxe.weebly.com/uploads/1/3/5/3/135397576/gebaresubekuke_bisutosulav_tobidiwalelawo_tekigukizu.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/b735e6.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/lezuvede_fejisuvi_loxologi_kikifu.pdfIn PDF document text
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/93bfd67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/afcd4e77-6c82-4a46-a904-7aba04edcf1b/carta_de_verificacion_de_empleo.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_418f74fc6e824739bdb091f6c5442fa6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takateg/27487417860.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_52654bc221a44150b969242661ea533d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d9927f-a1ed-4a51-ba5f-a31711c64311/assessment_commentary_edtpa_math.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_5dd80120a1a748a9bcdd1e65a53e3a4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risisipajole/85460619357.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 5088 bytes
SHA-256: 410ae98480d5d4b7c51ed66bc679bd95f91b5028978d81797fb41f5a8ee1e901
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10628 bytes
SHA-256: f670498ec509428895a739c263abceb5098e4cafdc2dca7f6a4a4350657045ef
font_02_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e