Malicious PDF — malware analysis report

Static analysis result for SHA-256 831d8683e21bd287…

MALICIOUS

PDF

71.6 KB Created: 2020-12-18 03:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d3c0defac935eb5750b027da9ebb9493 SHA-1: 13887e895bc9ef3fd4856d2e663bba1acfd286ee SHA-256: 831d8683e21bd287641b60bf70be997e6075e14aa5f3fdbb44282b264aab474a
304 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many hosted on disposable domains, and at least one known malicious redirector. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may attempt to trick users into revealing sensitive information like private keys or passwords. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://traffine.ru/123?utm_term=network+virtualization+for+dummies In PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/zizapemebibavon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5fdae87640424.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/jimipegiwovug.pdfIn PDF document text
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/474477.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/3000304.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/7380924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f89e5fb9c373.pdfIn PDF document text
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/4353727.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/jofekofotesixid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fcca31b52a2b.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/30ca4fc6-61c7-4a97-a851-dfbfdb29e0c9/forward_and_reverse_primers_design.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/favutovadugugesido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c10502-f988-4fe4-b849-bfe187276917/19785903434.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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 5172 bytes
SHA-256: 571677be0ecb292cbfed7dacbc307fb98cb424b33c865f2511e7aeed9b2e3f59
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 10440 bytes
SHA-256: 00ec574c1c4864d7c49d55886564c182b1c2dd3bcaf1fae26055321200d34c7d
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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