Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c9081efab4b57e…

MALICIOUS

PDF

86.3 KB Created: 2021-03-21 07:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d6e922c2551ad2fa5bbdf35cb8de1bc3 SHA-1: d92d772b4cc0331461a0c0efd8256a61e5e9eee8 SHA-256: e2c9081efab4b57eaf5a6972c49c4b1ad87360f9b0a8a3100ee48f465e9b8887
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1555 Credentials from Password Stores T1219 Remote Services

This PDF file exhibits multiple indicators of malicious intent, including ML classification, credential harvesting lures, and remote support tool lures. The presence of numerous external links, some pointing to disposable hosting, suggests a link farm designed to distribute malicious content or phishing pages. The document body, though heavily obfuscated, contains references to 'Android phone manager software' and 'wkhtmltopdf', potentially indicating a lure for installing unwanted software or a phishing attempt disguised as a software download. The ClamAV detection further corroborates the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jottigo.ru/123?utm_term=android+phone+manager+software+for+pc PDF link annotation
    • http://pexarinolal.mypressonline.com/22489077630.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/creative_writing_prompts_for_adults.pdfIn PDF document text
    • https://geneferazudim.weebly.com/uploads/1/3/4/3/134362459/2302977.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/becb682.pdfIn PDF document text
    • https://mumifigade.weebly.com/uploads/1/3/4/3/134314269/1700990.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/jejewilutava-xupexu-kesosegipimadik.pdfIn PDF document text
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/tipuvedir_dadoxazowofidap.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/legenapi/thus_spoke_zarathustra_best_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d246c3-74da-4132-be21-ecb29251af2c/how_to_reset_traxxas_trx4_transmitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0eaa45-36fb-4da5-ae3e-e80ab4f739b5/86089904004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2d2d65-a59e-4bd7-8f15-816c65dcaba4/samsung_hw-f550_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/le_syndrome_pyramidal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b99999-4496-40b9-9c5e-e2dbddc361ff/fadalemiredoxuzigurarep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5a5b7a-1501-4736-8a5c-14328c4aeb67/54619537407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504ca64d-a6df-4037-b86b-efc1bf524ce5/daxesarijebuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dde39e-1016-4ab1-abff-a53d106893d2/70111368100.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/59172657415.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/porter_cable_nail_gun_fn250sb_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/video_ashilla_blink_masih_cinta.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_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 5616 bytes
SHA-256: 2673bc6cadccd4f9fb81972cdadeaa3402f5b30141cfceb6e71175c75298c44b
font_01_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 10848 bytes
SHA-256: 7e5a5b72338c08c6092c7cc95e87405a72a2a5f8fb2ef1bd21cccfc450586549

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