Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8a41757acb0a14…

MALICIOUS

PDF

87.3 KB Created: 2021-04-08 04:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3198aa205681e0abf16da20c84c935 SHA-1: 20e41e74564712dcf056f46e61e446e0b38d286c SHA-256: 0f8a41757acb0a142dea2d127d881851632c1aa84b646d6ea1819c589e705209
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a site offering to teach the Bemba language, which is a common lure for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. The presence of an external URI and the overall classification suggest this file is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=learn+bemba+language+pdf
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fdfcb606eb04.pdf
    • https://static.s123-cdn-static.com/uploads/4387808/normal_600762c9e1261.pdf
    • https://cdn-cms.f-static.net/uploads/4374688/normal_605c171313b50.pdf
    • https://cdn.sqhk.co/parikozug/ifeidko/solesirub.pdf
    • https://cdn-cms.f-static.net/uploads/4496824/normal_60679e4f0be53.pdf
    • https://cdn-cms.f-static.net/uploads/4393499/normal_60663bc567083.pdf
    • https://cdn-cms.f-static.net/uploads/4485810/normal_6046b11d5ad97.pdf
    • https://cdn.sqhk.co/dobopejig/Vrm3Tha/henry_danger_crime_warp_app_download.pdf
    • https://cdn.sqhk.co/sirazisiluz/Hgcgjii/usa_gay_dating_apps.pdf
    • https://cdn.sqhk.co/riwutosax/j8gjjBX/16999663075.pdf
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603c70aaef63c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_875b69580d9c4983b0471a1703e1c5fb.pdf?index=true
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_cc273b6a2140462dbe8c73109fbf37b2.pdf?index=true
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_d1cf176a30104dbaa93ba64d73ae7f02.pdf?index=true
    • https://s3.amazonaws.com/mupukesunobaga/95786485047.pdf
    • https://s3.amazonaws.com/libowebujakux/51928106681.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_ab354e89d9e7437faacdf93475d9a0df.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_34ef052d86fe482abac56fd6bf81185a.pdf?index=true
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_16e4ce1c09894d1e89591163eca60a9c.pdf?index=true
    • https://s3.amazonaws.com/peveziwoguxuzam/14347245447.pdf
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_efcb702a18b14922843f10676bdc4f99.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001139e.bin
a286654d9bab38c9b740348d60475dee552d7ae6804ca30126a0f2e1b10b6fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 5264 bytes
font_01_sfnt_off00012573.bin
c33e7df1585f5372b204b2573ab2f719e031be79849124ad0cc19b225a22b68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 12520 bytes

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