Malicious PDF — malware analysis report

Static analysis result for SHA-256 0855963926d6fc42…

MALICIOUS

PDF

72.5 KB Created: 2021-06-11 18:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0e8fe5ca6ae0aebc67c24326ba05c579 SHA-1: 406681da43c11efb2780a4199edf2ba1f668e571 SHA-256: 0855963926d6fc420bd175911fa4dc4954b19aaa26f4ffae6b147391f6e9cecf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://archism.ru/pbw?utm_term=simple+payroll+system+source+code+java PDF link annotation
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/21309.pdfIn PDF document text
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/2404984.pdfIn PDF document text
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/zorapowanetokav_fesexolafakifil_jabewubos_vodes.pdfIn PDF document text
    • https://dodivivedi.weebly.com/uploads/1/3/3/9/133997878/046bd3dbc.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/mukomunekimaponix.pdfIn PDF document text
    • https://kakijukiwobak.weebly.com/uploads/1/3/4/3/134322026/rorisukegegife_pulawan_tosekalop_komipuvejivi.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/4a6f762c-e349-477f-b8d1-9e42d779ba67/70859370166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c864ec43-3624-470b-914b-147f745b006c/fifty_shades_of_gray_actors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f35112-63f0-4468-b014-cfc2ba43e796/how_to_hack_hungry_shark_world_with_lucky_patcher.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/144542520/76130522395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f4f07e-986a-4eac-a266-4cb4b42cb652/litumukesorudaxaxexejelig.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/wella_liquid_hair_toner_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ec3dd0-d095-486c-8845-8630ceb9f8af/c-fern_life_cycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3295e7ef-55d0-49ba-b3c4-453bd1f9c3ff/laduxuzamesuvamumiwever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618e7726-cb2b-4619-8958-0f0f9b335c83/95563448519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300d3560-3811-4db0-afa3-5e75c7e342a1/22195481310.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144896613/48958962191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cd0ba9-720f-4083-99f7-4fb111111916/the_strength_training_anatomy_workout_iii_maximizing_results_with_advanced_training_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2229e65a-dec8-4151-acb5-35b85aef55eb/lupepojuvep.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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 5560 bytes
SHA-256: 178598927857eacaf10286c36e94b5bea526d2e8ded742f9defad72bf0e1acfb
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 10688 bytes
SHA-256: 15b892ee951d8c466552cca29ec36d08fe4f9f7a2713aac8f573c837cbb4cdda