Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8578d62dec55db…

MALICIOUS

PDF

80.8 KB Created: 2021-04-17 10:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1fa03b6432387ed746e52abd5659693e SHA-1: 88dd82171edbd193e7cb567d0ee0743c11cc5dd7 SHA-256: bd8578d62dec55db3d6e9a0dec3d75d906c3918583e47f1c7a9bd4bd84d1590a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external sites. The document body, though heavily obfuscated, contains text related to 'Fl studio mobile hip hop sample packs', suggesting a lure to attract clicks. The presence of numerous external URIs, including those on disposable hosting, reinforces the assessment of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://midufefew.ru/strik?utm_term=fl+studio+mobile+hip+hop+sample+packs PDF link annotation
    • https://cdn.sqhk.co/fogobewataja/IiiaOid/genavufazed.pdfIn PDF document text
    • https://cdn.sqhk.co/rawavuzom/bijjfhC/mazenabadukapu.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/jSDjbOn/mezeboxatagiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/00ge1hd/54446474270.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/bVrxih9/xirasimogonawizeduz.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/dds5Xgh/nutekevuwawenu.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/ihWbier/75061824318.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/CghzgfG/vobewirabokomij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_dd3fb86bf5364d83a509fd16e1b8f357.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_2edca44c9d564bc6847a16c9f786cb09.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_559ff75096814d5783cae74d42450ea7.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_28ba7f553f22460684c99be62faeb17e.pdf?index=trueIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_a51ee383e5494b4aac908ff3ad79bfc4.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_7e4af918e8dd4378bdc64a84091603e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotodur/58050019466.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_3cc9d70d2a7e4059bad0c17744da7961.pdf?index=trueIn PDF document text
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_0ad92ecc59134fbdba6a7cf054830207.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_376a5fcab4094b838d253b702620fd53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/navy_blue_shirt_wear.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_c6c1d1015ee14bc2bdb7c765383772cd.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_b3842ef537d34cb2bc34bba4b07739ab.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_12de7a71226b466291642904123d64e7.pdf?index=trueIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_20651b4dac2e4b0ab747511dbbeb41a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/vivepilu.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/nurava.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_e6b06a9732114d918c00cece3fdc991f.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_557cfbb6422345ac9391e3f38054a530.pdf?index=trueIn 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_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 5376 bytes
SHA-256: 9dd784d301e9ec9339e9dd534168b6b142a4869362b4b65e75de2614945a39b9
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 11392 bytes
SHA-256: 62012de34ce7c988602015a75f264979efe4a87df9e8c666aeb249f5a2cb851b

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