Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e731899a220bc4…

MALICIOUS

PDF

81.7 KB Created: 2021-05-15 22:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8b25e8ae4a69c378cdbe2030fee0d882 SHA-1: d4b8328c8ee8d8d4ca3d36e92fc991e434f37e31 SHA-256: 88e731899a220bc490770eba4e0f09b5ddfa8b62225392a386ec54d9b642c523
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the extracted URLs, https://xajibur.ru/strik?utm_term=navy+job+vacancy+2020+for+female, appears to be a malicious lure related to job vacancies. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing or redirection document.

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 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.
  • 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://xajibur.ru/strik?utm_term=navy+job+vacancy+2020+for+female PDF link annotation
    • http://wisitens.online/77112472075kgs5o.pdfIn PDF document text
    • https://jesaguxofugu.weebly.com/uploads/1/3/4/6/134659129/virofolimo-nuvetix-movesirawimufu.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/f9831a4867268.pdfIn PDF document text
    • https://zumasugi.weebly.com/uploads/1/3/4/8/134864891/piloxuxovi.pdfIn PDF document text
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/vekep_goderupe_wewokuz_foluduzituka.pdfIn PDF document text
    • https://gabavogafev.weebly.com/uploads/1/3/4/0/134000006/vawupilizuf_pufowejafaropit.pdfIn PDF document text
    • http://afracheat5.xyz/womivewakuzusofevamaz92is.pdfIn PDF document text
    • http://qrettalq.online/414869190886ijt3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/carrom_clash_apk_real_money.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/xabuzisonesek.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_fb0fa72cf5e9443caf115131961aff5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farokof/meperipevibupesixus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdcd6ae-cb18-46ac-abf8-c6c7acb13ca4/reality_transurfing_by_vadim_zeland_-_steps_i-v.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/maletangwao_all_songs_free.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_410d9c0e1f934e758ce16fa630c66dda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/3524354504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4339291d-623f-4b4c-bda5-3f9ddb03f9b1/calories_and_carbs_in_leaf_lettuce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73de91b1-f1bd-4729-9c94-a9dcd38f600c/naval_training_flight_crash.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/cherished_teddies_value_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/italian_lessons_for_beginners.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_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 5472 bytes
SHA-256: 866f0313525ddc6f551bc20a73e9dda7a7812c2fe2886c9882330cb260749a32
font_01_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 11156 bytes
SHA-256: 96d1ebb9e478e583bee2d5199e4bfc79f6d6b1634d4662eaf3777e883950b89b

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