Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a5c986bba27e27…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 21:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 6a8e51a068e7153112af3336ffadf5dc SHA-1: 41e659922f158ec01129b149bcd078ef368dff05 SHA-256: f8a5c986bba27e274f4a708eecde1a5650ec88d8a9fc38604861b5849f1f0854
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a ClamAV signature, indicating it's a phishing or trojan PDF. The PDF contains a significant number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, 'https://druttle.ru/aws?utm_term=predator+4000+watt+generator+manual', is presented as a generator manual, likely a lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest potential for malicious content delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=predator+4000+watt+generator+manual PDF link annotation
    • http://heliusdesign.ru/sql_server_management_studio_2016_tutoriall34v4.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/matof.pdfIn PDF document text
    • http://lami-lashes.site/51347858536u2yoc.pdfIn PDF document text
    • https://zetokefukakebep.weebly.com/uploads/1/3/1/4/131438441/e735bee2.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/jifexojuwekidasuzelv03tc.pdfIn PDF document text
    • http://ideaita.fun/how_to_change_aspect_ratio_emerson_tv72x19.pdfIn PDF document text
    • http://gouliwer.online/past_perfect_tense_worksheet_grade_7ujgtk.pdfIn PDF document text
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/dd26c3444ed627.pdfIn PDF document text
    • http://select-get.top/11869416777bxa6i.pdfIn PDF document text
    • http://monongzhlh.space/what_is_the_best_stock_to_invest_in_right_now_2020dgvak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab68504c-9c68-4d93-a5dd-b6fc891b1ab6/what_to_do_when_your_garbage_disposal_makes_a_humming_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/49008755028.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/ielts_academic_writing_samples_band_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bd91a6-71fe-4c15-b3f0-b5b2b49ed5c6/how_to_fit_integrated_dishwasher_door_bosch.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/3728988819.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/65035416784.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/midetofunoraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8480fb-e94e-4171-bab2-22cde26f81fb/kusewuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0a5ec4-b3f4-4cb5-9a3a-e130ff968154/pududanaxilevosigatinizeg.pdfIn PDF document text
    • http://durunorutap.epizy.com/19186571749.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/score_sheet_of_kho_kho.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 5288 bytes
SHA-256: 5103ca542c84de4da69a10bbc8e2030c7efb9f59469369155073c55dc9d0a7be
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 2076 bytes
SHA-256: 26c746d8a21c50ad21e30d74cf30b24ab4a33d794d089756bbfc207ec540187f
font_02_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 11068 bytes
SHA-256: 37134b566a55afa15f2676819557477bd4fa3068e133c67baf940a2c966f06d6

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