Malicious PDF — malware analysis report

Static analysis result for SHA-256 137dcdf198115994…

MALICIOUS

PDF

88.5 KB Created: 2021-03-31 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f98c5f44b73f642cff1b1869dff4e396 SHA-1: 2c0fd069594f67f09dc351e8911503702892a669 SHA-256: 137dcdf19811599491187d1640f6238235cce93c762eda7d40d71af8efa2ba60
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though heavily obfuscated, suggests a lure related to 'powerful think and grow rich quotes'. The presence of external URIs and link farm heuristics points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=powerful+think+and+grow+rich+quotes PDF link annotation
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/kifamufine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fffd9dd5c0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_601edd9f31232.pdfIn PDF document text
    • http://zimegubavij.22web.org/xosetepufevisowuxuwolaf.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/ansys_cfx_help.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_60300820dbba2.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/jf9vMMx/pimiribuz.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/xifosukej.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hb03NE8/space_wolves_tactics_goonhammer.pdfIn PDF document text
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/tikiweligixisaxajo.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/iM1wdQh/dupipix.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/wefemodanon.pdfIn PDF document text
    • https://fovozipi.weebly.com/uploads/1/3/0/7/130775458/pobewubuxobulamur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_603cb075adaf0.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/3n1mnig/music_nonstop_60s_70s_80s_90s_now.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/pezezonipuwimapuxare.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/9d8d61f1e5f.pdfIn PDF document text
    • https://dekukosozo.weebly.com/uploads/1/3/1/0/131070054/danewemajewej-lunafedugotugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogafaxusa.epizy.com/61667571230.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_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 5568 bytes
SHA-256: 1d43c180315e70e20c2d27b4983faa4a22cf3b8398c95d89263286bd5c4fe232
font_01_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 10808 bytes
SHA-256: 27e765928c74c78f0e64eb324cce88d07e3d3fd267ca1f44a6778b0b97fa01ff

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