Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3deb066b641d88…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 16:37:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17cf75e8a6388fde4389aeb9778a30e6 SHA-1: b06162e78337b2a94cfdef635452a15322ad9227 SHA-256: cc3deb066b641d88f32411e9bea5d6d706ea99647ed405a6307e57312636cd3a
156 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 phishing or trojan threat. It contains an external URI pointing to 'xezojetit.ru', which is likely part of a malicious campaign. The document body, though heavily obfuscated, suggests a lure related to 'postpartum depression definition pdf'. The presence of multiple external links, including one flagged as a link farm, further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=postpartum+depression+definition+pdf
    • https://cdn-cms.f-static.net/uploads/4384470/normal_6030fe13a4c41.pdf
    • https://cdn-cms.f-static.net/uploads/4475716/normal_60235ed436940.pdf
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6014734e70087.pdf
    • https://cdn-cms.f-static.net/uploads/4408187/normal_602c6125d5871.pdf
    • https://cdn.sqhk.co/leguzufaju/bvgRZcE/dictionary_append_c.pdf
    • https://cdn-cms.f-static.net/uploads/4494147/normal_600bbfdf4ed37.pdf
    • https://cdn.sqhk.co/vawapisoxe/8pJZlME/vovipapogoruv.pdf
    • https://cdn.sqhk.co/nagotumubo/hiSHNsA/korolikamilowusegutetaju.pdf
    • https://cdn.sqhk.co/saxamabewido/jebGhjc/23623976871.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_9359af1052d3454b8ce3317f65f8222e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/17f15713-7480-4eaa-a780-c50bb4df7cc2/allen_carr_download_free.pdf
    • https://uploads.strikinglycdn.com/files/3f72e40e-49ec-416e-b279-1734024a956c/dan_brown_angels_and_demons_symbols.pdf
    • https://uploads.strikinglycdn.com/files/5c9314d2-bc14-4fc8-978a-a4c91bd8562d/bazasi.pdf
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_8487cc5f4628403ebd97c2ca1e5c5621.pdf?index=true
    • https://s3.amazonaws.com/veraxawewib/banana_song_minions_video.pdf
    • https://s3.amazonaws.com/davolazupivowi/45585835758.pdf
    • https://uploads.strikinglycdn.com/files/55a767c5-4e87-4ceb-99c3-170134737a93/wokenonavo.pdf
    • https://e21f0dd0-e693-4a2a-aa38-6cab66162128.filesusr.com/ugd/34eed6_3b81130f360a4fb1a2ed9a31cf317aad.pdf?index=true
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_e8d440957f224b79a3068ca2b8789922.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_off0000e727.bin
4c9271f9cd125538871289aae86f538bdb88a099855f8b81a7e144b001ae6a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 5156 bytes
font_01_sfnt_off0000f89e.bin
6dc052624af6e9b0918183bd7f97fdf5562a9b66da39e01a52a9b8bb09ea4ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 11048 bytes

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