Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c97afad1d7087ab…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 16:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 139d9c492735f00c779bf47c69b33578 SHA-1: fffb205ec8ecafc596f66a4d4d0a8a71af2243ea SHA-256: 1c97afad1d7087abe30a5c993a64b59a2d04f8caaf7aca43127db84cae8960fb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://soxebez.ru/aws?utm_term=plc+programming+tutorial+for+beginners_+part+2 PDF link annotation
    • https://wojagezut.weebly.com/uploads/1/3/0/7/130775605/4057751.pdfIn PDF document text
    • https://silatasetexa.weebly.com/uploads/1/3/1/6/131637876/c4b76.pdfIn PDF document text
    • http://mupifojoxur.medianewsonline.com/gebudum.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/receptive_and_productive_language_skills.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/sijepamumezetuvojuga.pdfIn PDF document text
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/xotivix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/92ca7eac-7b74-4529-9785-078eaf911b0a/koviwanubopimeperubajogip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01fc49a8-d83c-4e5b-89d1-3ea80e61e90a/pilunoluxukigamagofiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ee84d9-e848-4612-8c90-33cf6b2c7867/wuwezebupupizob.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_490e71f6bb164b4c9ddde85156446e32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6027b41f-5ed6-4310-8ada-51cba47054c4/nalapukafomoxux.pdfIn PDF document text
    • http://woranuganavot.myartsonline.com/3843170514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976e2d1f-3aec-4946-a401-ca0baa79a9b0/3973777590.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/what_oil_do_you_put_in_a_honda_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b8f0c3-6658-44ff-a07f-4eb5272414ae/hua_hu_ching.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1786b4-249b-4dba-ae38-575f1d892218/bose_acoustimass_10_series_v_5.1_speaker_system_watts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39d6850-a387-42d8-b556-e3da634f0e0a/51487259365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f995b098-1b41-40b5-a535-3f6283a30253/why_is_my_tv_not_picking_up_hdmi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd8324a-2dfc-4f9c-9425-ff0bab362f71/danasokomumumi.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_79b6de5a329444d0903b4e50c5cc701a.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_e1265e0d5859474596ccfb22f7cfcf37.pdf?index=trueIn 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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 5520 bytes
SHA-256: d9cf9212262a8533f70f4ec5b1cecba8b4c039dcfe852beca60345308d9d5de0
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10384 bytes
SHA-256: 33ff4ed5bff44b6b60bd1bbe8663556eb83ff6c5e6c889b6628c6e3db5db5176
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c