Malicious PDF — malware analysis report

Static analysis result for SHA-256 4040bc078c7fb8e3…

MALICIOUS

PDF

79.4 KB Created: 2021-03-22 18:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ad3c2ffdac8c85b57eaceb7bf7d569b9 SHA-1: 1167d2f71f9af391b5fcc700e050295c0808703c SHA-256: 4040bc078c7fb8e34cac2056cce06f406f16f144c1bae3928731214dcfd4de17
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam operation. The document body, though partially corrupted, references 'Ragnarok online battle acolyte leveling guide', suggesting a lure to attract users. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly suggests malicious intent, likely related to phishing or distributing further malicious content.

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://seumenha.ru/123?utm_term=ragnarok+online+battle+acolyte+leveling+guide PDF link annotation
    • http://kapimivibix.22web.org/amphipathic_lipids.pdfIn PDF document text
    • http://gutoguzo.iblogger.org/24021454231.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/xosapisigiwuzi.pdfIn PDF document text
    • http://xudisoda.66ghz.com/ancel_fx4000_user_manual.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/febdfc0f5d27.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/sukobogixe/kia_cerato_2011_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad911d51-ed75-4f78-a8ec-d26f8e3ef8e2/gabikusuvazusowixakel.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/80516425560.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/dedavotagudadavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f58c786-cc0f-42da-9ca1-054fc17327d0/my_maytag_centennial_dryer_wont_turn_on.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_34a6882d58724327adddd3ab370e7810.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78723101-7f0b-427b-936e-9c1a9fd6d691/how_to_cook_a_glazed_ham_with_pineapple.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_9d175ba89a56438aaf0cefe9472ab18d.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_b92b81f87ac44583ba96de387f38f49d.pdf?index=trueIn PDF document text
    • http://mukesijurifa.epizy.com/benazir_bhutto_university_peshawar_date_sheet.pdfIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_1261fd283a414d6d956b04e5b88de727.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_9f2c7b58e827453a8ec63b9c09518914.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d86e93-d9ba-43ab-8571-f2768e3e192d/7522601936.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_b4aa385b0b124ae7b6b81c81859a1864.pdf?index=trueIn PDF document text
    • http://motinekan.epizy.com/arab_horror_movies.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_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 5304 bytes
SHA-256: b71ef89631ebb2f67e0835f81e962d98258de4365c7f4c3d1986dcec2867bbd2
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10976 bytes
SHA-256: fd8c16f0101f60cdcd16ad93c50ecc3c5472abd10909434afb98e7096fcdd8e9