Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cee5c16b68e888…

MALICIOUS

PDF

68.9 KB Created: 2021-05-03 18:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b20510104945f7f4587160fc23a1413 SHA-1: 49069308c2622abc3bf86cd2bc1b9ed2509aacef SHA-256: 81cee5c16b68e888807518f7e9d64ef32350d030f81f4bc9b3053bc572cd8b30
166 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of suspicious and invisible links pointing to external domains, suggesting a phishing or malware distribution lure. The document body, though heavily corrupted, contains fragments related to investment, which could be part of a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://golowaki.ru/strik?utm_term=how+to+invest+in+money+market+india PDF link annotation
    • http://effektzhizni.ru/accounting_for_managers_exam_questions_and_answersh632p.pdfIn PDF document text
    • http://bilkaita.space/icc_500_storm_shelter58119.pdfIn PDF document text
    • http://copyright-central-media.com/19706208515fojp6.pdfIn PDF document text
    • http://doctorzlo.com/74590769820zhmza.pdfIn PDF document text
    • http://mivetys.xyz/tintern_abbey_explanation_line_by_lineumnou.pdfIn PDF document text
    • http://managerprogram.live/8041348161vegh5.pdfIn PDF document text
    • http://iceteas.space/37158736409yb9ol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_600fbf2db8ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_605fb04e2c6b3.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/pazopumisaroj_berasufedanisiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fffa98031f45.pdfIn PDF document text
    • http://oneitshop.pro/complications_a_surgeons_notes_on_an_imperfect_science_audiobookl6fzo.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/najipunoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_600ac9bc67f5c.pdfIn PDF document text
    • http://normaa-id.com/316177901515v6su.pdfIn PDF document text
    • https://kobafadovuzek.weebly.com/uploads/1/3/4/3/134311208/dibavupikop_vevabebur.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/bugadogagivad_rodubumev.pdfIn PDF document text
    • http://uablog.website/macbeth_igcse_notesv3per.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/243ee355-9ccf-4edb-8327-c2ae8a6c214c/sobetukimot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c508ec6-2e1c-42a3-90e9-0ea309391678/summary_the_raven_by_edgar_allan_poe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8f59bb-be66-4628-b7e4-12783c8381a4/road_to_hana_map_from_wailea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc51d21a-67e8-4321-92e1-edc6c8059bf1/what_are_the_different_types_of_literature_briefly_describe_each.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9109f03-62a4-4561-b3ed-9b9f271d5a5f/can_you_make_flan_in_a_metal_pan.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_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 5216 bytes
SHA-256: b397eac1f30ce0e2ff2daa2a5ec2d280f5b2b5ba1c3bcbc6fb7d07af6597bf72
font_01_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 9828 bytes
SHA-256: d62c50d6c5d985bfbd63a3427a6041380ef6e00555f6a3fff9224fed9520b4ae