Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87161526201cf87…

MALICIOUS

PDF

67.4 KB Created: 2020-12-17 20:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 47aaf2ed83eb83eb4083f2a860d0d380 SHA-1: eef4038d9b68d0fd799a2d85554b506be63f17cb SHA-256: a87161526201cf87d7ddd5c03b60deb5587223c0330806b6ed6fde17d1323335
244 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it contains malicious content. It features a significant number of embedded URLs, many pointing to disposable hosting, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, further supporting a malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the overall detection suggest the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/strik?utm_term=live+sports+streaming+apk In PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f8d8b5fe5bb6.pdfIn PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/f686b3127a335d.pdfIn PDF document text
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/703f5e9959df76.pdfIn PDF document text
    • https://bepevefobe.weebly.com/uploads/1/3/4/6/134699504/gozofuduvuto.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/5180420.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/edc4a701-5ce0-4e29-b3a6-9cbca3cf4aac/zadafepegeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430a575d-a77c-402f-9a2e-897538aaf98f/39295467347.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/29846834775.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc191840a2757459be79fd2/t/5fd1918323f2866aa3833c9a/1607569795554/chick_emulator_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe40165-1913-43ad-aa4d-0d1b826fecf7/xijubavanarevoxarubu.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/grammar_practice_exercises.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_off0000c9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 5172 bytes
SHA-256: 2cebc5eb876c412cec84b3fd7b1fd757d3d19e03692ec4a389df9ba75569b7a7
font_01_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 10540 bytes
SHA-256: ee0a4c514f935613d5d50487a7d3ede777c879ec0a2ccb61ba012d3bd578ece5