Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87404be5eda7a58…

MALICIOUS

PDF

69.1 KB Created: 2020-12-29 13:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af216f1942412f278005ebe0620ec7fc SHA-1: 15fe66689321176ef9c5dd5f50adf61edc167497 SHA-256: f87404be5eda7a58c9bac9096377aa1e5ecd3b4698b3e04455827f32d0c95299
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://trafffe.ru/123?utm_term=identifying+types+of+rocks+worksheet PDF link annotation
    • https://xaniwunedevivat.weebly.com/uploads/1/3/4/4/134470123/goparejasobo_nuwarutexodu_zewoxovo.pdfIn PDF document text
    • https://pikelevadesos.weebly.com/uploads/1/3/1/3/131384679/wituberip.pdfIn PDF document text
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/6056060a3.pdfIn PDF document text
    • https://sudusomot.weebly.com/uploads/1/3/4/2/134265470/zetiwovataj-wevawof-limiber-maluwaginetedu.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/4925352.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/pilosibasusiki_votop_modutivakefeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xujitezu/nalixedavebaderaxaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/seminar_play_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5962183-ef6f-43b9-a0fa-fa56c42b06e6/11635736192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6d1bf7-4e86-449b-a598-59f19dcebbc9/84249256441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92188c42-b3ce-4b14-aaf8-b4784fdccf05/48971547618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5134785f-c2ac-4ddc-a779-c2e030aab689/romeo_and_juliet_writing_prompts_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d92b86-f077-47e4-8caf-aca401183a23/meijer_return_policy_on_fish.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_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 5368 bytes
SHA-256: 77a5ca0201fcdddc33254f56ba38173ba79c1e34a72d4ce49c4ececbbc12e5cd
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 10508 bytes
SHA-256: f9beaebc48dee818ac36169a26c79f70131fc87b85df599cd5e0c7007257a3db

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