Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44d63a5d5db96a5…

MALICIOUS

PDF

95.6 KB Created: 2021-03-09 19:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced74182f291d2a085d59e747fc95817 SHA-1: 1839c4585b7ec30ae8d30b979031b72217e5eafc SHA-256: f44d63a5d5db96a56d8f6abd5d8dcef6e5e9d2c45c97044a9fdc7bf28f58fbdf
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains an embedded URL pointing to 'dafemum.ru', which is likely used to host a phishing page or download a second-stage payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of PDF_URI and EMBEDDED_URL heuristics indicates the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=sony+trinitron+tv+weight
    • https://cdn-cms.f-static.net/uploads/4420028/normal_601f1385a25e1.pdf
    • http://jekigun.22web.org/92433056048.pdf
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5fe2a66e9de58.pdf
    • http://suxawid.iblogger.org/wogadizopazawatabipokut.pdf
    • https://cdn.sqhk.co/kolusugego/gj2hapH/70382643859.pdf
    • https://cdn-cms.f-static.net/uploads/4481062/normal_5fd893cf5f299.pdf
    • http://mavunijikame.iblogger.org/singapore_math_5th_grade_textbook.pdf
    • http://xelutorul.iblogger.org/62779389282.pdf
    • https://cdn.sqhk.co/vanewano/hjeDfij/hideous_destructor_ugly_as_sin.pdf
    • https://cdn.sqhk.co/bitaxukezor/Mgigd00/nails_ideas_fall.pdf
    • http://rofogukiluvupu.mygamesonline.org/zesisaje.pdf
    • http://xovuwut.iblogger.org/wopojitejene.pdf
    • https://cdn.sqhk.co/xomorenut/UgecQih/mirin_dajo_david_blaine.pdf
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fe0b7f8829e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xiwinuxad.rf.gd/43387749316.pdf
    • http://sukokovevaz.atwebpages.com/the_fourth_book_of_occult_philosophy.pdf
    • http://sasaxunofob.atwebpages.com/biology_the_dynamics_of_life_answer_key.pdf
    • http://pukilosik.epizy.com/mebanemikum.pdf
    • http://kesojavutuv.epizy.com/dufetelawefekega.pdf
    • https://s3.amazonaws.com/rovikibixu/10370243907.pdf
    • http://vatasinunevuto.epizy.com/microsoft_dreamspark_visual_studio_2010.pdf
    • http://fuvarijes.atwebpages.com/29089254263.pdf
    • https://s3.amazonaws.com/bidivo/759357989.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013c00.bin
d105f9f71271cd30ab893afd7ee323f6dc7f2c85b59d0caa847467158aa7e55d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C00 29508 bytes
font_00_sfnt_off000106c2.bin
dcb8af180128a22b4fead37386bafe67124c07d45013839baf50d2797638dc7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 4884 bytes
font_01_sfnt_off0001177b.bin
cc70f9ed595066f524414308676bb7c9de7711e92d8277ad2f06f1ca3f7ea7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 10636 bytes

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