Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91fb5c73c42b6f8…

MALICIOUS

PDF

144.7 KB Created: 2021-04-03 21:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f642264b47263a172c4df135d2264463 SHA-1: 726961967b85da2e498e223fa3ea83247cd9eac0 SHA-256: b91fb5c73c42b6f855a2473dc89afa1097ab2f5803ab0178e1ff33d63f4fa8cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which point to suspicious domains and appear to be part of a link farm designed to manipulate search engine results. The presence of these links suggests the document is intended to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-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://midufefew.ru/award?keyword=apoptosis+signaling+pathway+pdf
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/9d156.pdf
    • http://pro-konditer.com/firolujozujiriwotz0u9w.pdf
    • http://bobejitamatu.iblogger.org/delicious_emily_honeymoon_cruise_android.pdf
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/4caffa2156.pdf
    • http://openplafond.xyz/96942233829prp88.pdf
    • http://yatvoyya.fun/netgear_dgn2200_v3_firmwaree90ap.pdf
    • http://fdvsefwfrw.space/99727321382yfcl4.pdf
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/8300588.pdf
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/9520595.pdf
    • http://busibear.com/par_q_form_nasm3om3j.pdf
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/2e6ea283914.pdf
    • http://bigonetudukori.iblogger.org/46587039620.pdf
    • http://sadanojigoma.22web.org/70029788581.pdf
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/zopadu.pdf
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/5912649.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/futolozenejo-kitujezudulig-vabezabup.pdf
    • https://livozuduk.weebly.com/uploads/1/3/4/5/134583284/dujaxosebo-sesinege-siven-botikejexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nazekisigiduz/hd_video_er_for_iphone_x.pdf
    • https://s3.amazonaws.com/dowavelaxam/fractions_to_decimals_worksheets_grade_4.pdf
    • https://s3.amazonaws.com/zuguvoxoki/16912076343.pdf
    • http://kokiralasido.epizy.com/floor_joist_span_guide.pdf
    • https://s3.amazonaws.com/varolexexus/the_punisher_imdb_parents_guide.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f269.bin
ea44bbdc8fe0b11b00acf0de088dc9df3cad2b7782fc1db9c829044f19fb8cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F269 5392 bytes
font_01_sfnt_off000204d6.bin
488e3c8119ce0993e263475b04a20a31a325e80f4fb6c00a30334364a751b369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x204D6 15428 bytes

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