Malicious PDF — malware analysis report

Static analysis result for SHA-256 82750575dce92c11…

MALICIOUS

PDF

80.8 KB Created: 2021-03-15 23:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1c7d6c15adda2777ad28ca904578de7e SHA-1: 3e9710b79b88421a060ad91055f86fcb80c8718f SHA-256: 82750575dce92c11b62b92260ff10689dfaf8a33019aa2572f243148d8c8b8e8
186 Risk Score

Malware Insights

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

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 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://maypoin.ru/wix?keyword=kingdom+hearts+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fd8f5532822a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_601d2cb8b5cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fd9d4774bcf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5ff8b7a825c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_603b40b55dd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6022a12453d65.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/standard_iq_test_questions_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_600f0779d1580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_604f1aaa77fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_604e839580ac3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_8e14e1111a4d4e7280156e55a1ae818d.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_7e73934e0b3d4073bd1a13664d3da29d.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_76451f82b43442afba3582a6cd06f3cd.pdf?index=trueIn PDF document text
    • http://noxikemudenuma.epizy.com/47330190875.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/24343607900.pdfIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_b122750f4ea349a5a881cb83d06cdff4.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_a0b7fece085b41a7ae576f172fd7d34f.pdf?index=trueIn PDF document text
    • http://rirojirijuguga.epizy.com/zuweroresadavepokomevu.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_c81dca9a6c354a85816f4301c822e9b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/41030630833.pdfIn PDF document text
    • http://jodolevuvik.epizy.com/namifeperavug.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_cc42aaf6e19e45249ee978bd63a47392.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_d0c89eb4a60e466ca9d12b4133fb46e0.pdf?index=trueIn PDF document text
    • http://fewuzefar.rf.gd/bemekokagosalabijik.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_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 5292 bytes
SHA-256: 4561ad329570712bbbdfe7aa66f4c452c40306c9caebdb04d25c90260c1bebae
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10948 bytes
SHA-256: 21647321f3ecc3bf96d09cca19cd5e3e931521a0f4bb8d5654210a2b21386ded