Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1bbe6653aa46ac…

MALICIOUS

PDF

79.5 KB Created: 2021-01-08 18:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ea3fc02ddef831c1bde0b996ccde8ea4 SHA-1: b8444f2dd054c39dde7cb1e094aa4c05a180c7ff SHA-256: 5c1bbe6653aa46ace5d0a0e748d8dd67f47ad76ea6abc0bdcefbed0bdccf136f
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a popular book title to entice users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=diary+of+a+wimpy+kid+the+third+wheel+book+level PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5feea505f01e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fcae900f043c.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/Cjcjjjj/game_of_thrones_cast_season_7_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/haFLhaJ/80068058375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5f9e637b683aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_5fc31f3252961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f9f3f7583714.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/TGjjgeY/doomer_girl_fanart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5fce723ee23b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5f8c79de4817f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pigolo/tawupoberubik.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/antebellum_reform_movements_temperance.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/lidikiju.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/32721232346.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/ladukeliroxabopukixode.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f5fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5FA 25016 bytes
SHA-256: fd9a6d0d6b95eef3adf31a9d97a19d100e7f0a45583f4c155ff2965b276f6dc4
font_00_sfnt_off0000c0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FA 5244 bytes
SHA-256: e2e3e448e3db8abd0cd4542e02c23188c7a3c050286cacc7634be99b99bd1b6e
font_01_sfnt_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 10148 bytes
SHA-256: 6ddc8d68f6557e57876c4b4d8f33bd3a1b23b2e6540d1bee010ecd5ec95c8915
font_03_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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