Malicious PDF — malware analysis report

Static analysis result for SHA-256 5314cb1453af6306…

MALICIOUS

PDF

81.8 KB Created: 2021-05-21 22:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54050bda1b2d47465f7ffab2f3c1ec09 SHA-1: 46abb156f5722e3fd5b1b04aeec59b3ab01f259a SHA-256: 5314cb1453af6306d6711386159d95ca731de9f5d0837c67e5778f7fe32ba009
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://resalured.ru/strik?utm_term=kermit+the+frog+in+a+blender+joke', is likely the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=kermit+the+frog+in+a+blender+joke
    • https://cdn-cms.f-static.net/uploads/4501212/normal_6050dce82d305.pdf
    • https://pebuzifidam.weebly.com/uploads/1/3/2/8/132815752/vupog_pesuf.pdf
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6043fa87b573f.pdf
    • https://sezowizubuv.weebly.com/uploads/1/3/0/8/130874308/7098258.pdf
    • https://cdn-cms.f-static.net/uploads/4480590/normal_6031c35889f3d.pdf
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/vijulotiwezenofa.pdf
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/tunediwikekawiwe.pdf
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/28518149.pdf
    • https://gotitodurafa.weebly.com/uploads/1/3/4/3/134351762/8767801.pdf
    • https://static.s123-cdn-static.com/uploads/4483842/normal_5ffed0175f84b.pdf
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5fe3bc9631088.pdf
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5ff0025376534.pdf
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/3ab9fde.pdf
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5fc850fae73f3.pdf
    • https://fimelaxezabu.weebly.com/uploads/1/3/4/6/134622198/0d7fd9816a04b83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0161d2e6-b913-4534-91ca-53e61d9395cf/why_do_i_keep_waking_up_in_the_middle_of_a_dream.pdf
    • https://uploads.strikinglycdn.com/files/557ddc4c-da1d-48ee-912a-2f4eb845eb27/hoover_elite_rewind_plus_instructions.pdf
    • https://s3.amazonaws.com/mefadedosuw/bizuwufezanolobazuguguliv.pdf
    • https://s3.amazonaws.com/patilawasu/aruze_slot_machine_tokens.pdf
    • https://s3.amazonaws.com/makixibawumebol/durugizerogizerotise.pdf
    • https://uploads.strikinglycdn.com/files/01c3935b-6952-4168-9f42-9e5ca87ee81d/epic_of_sundiata_characters.pdf
    • https://uploads.strikinglycdn.com/files/12feadb1-51da-4800-bee5-82728ee693a6/86810451656.pdf
    • https://uploads.strikinglycdn.com/files/a62b4042-17f2-4083-8820-2bdfa7e4cac8/45612571491.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b5.bin
d3bcc761d03af2ce614c521eca1ba7303a637cba533c9a5687dc0d425750fdd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5180 bytes
font_01_sfnt_off0001052e.bin
671c84ddcc4693d38e47888021f050a26ef6e2441d9009a87eefa1a8696781be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 11380 bytes
font_02_sfnt_off00012bc8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 4324 bytes