Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd66e56f59881089…

MALICIOUS

PDF

135.8 KB Created: 2021-04-07 21:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 579021c783f490a7e9cf43118fd8cd05 SHA-1: de8b65792512a12e4f7ba66e16d1f2923bfbdce6 SHA-256: cd66e56f59881089e81aa9e7bdc8589f325f6e279188ff46482e7793a673fe5b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://pelibifir.ru/aws?utm_term=le+petit+prince+french, which is likely used to host or redirect to a malicious payload.

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
  • 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://pelibifir.ru/aws?utm_term=le+petit+prince+french PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6022a00b05609.pdfIn PDF document text
    • http://goproonly.com/55719482517bln4j.pdfIn PDF document text
    • http://lidlid.xyz/lego_batman_2_movie_dc_superheroes_unitea6rla.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_6002c6ce8d6e2.pdfIn PDF document text
    • http://winoraama.fun/sakoxavipinowezibdog35.pdfIn PDF document text
    • http://thehensleys.org/sonobovoxudipaxusirevaseku7ad.pdfIn PDF document text
    • http://letnesil.xyz/yard_machines_lawn_mower_partsxrsmn.pdfIn PDF document text
    • http://topcreditcheck.info/what_is_the_definition_of_external_structureewu6z.pdfIn PDF document text
    • http://uspex22.online/unit_3_review_packet_ap_human_geography_answer_keyyq2t5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fee243e47301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6048c54746cc1.pdfIn PDF document text
    • http://help-copyrighteamservice.com/what_is_a_good_quality_speaker7m3w5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_604668039bce8.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/1c359f86-704b-4292-b139-1787e802a153/mitumisakaxulevixoleluwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fc4d9f-4df2-47eb-a7eb-2b536438accc/1389573672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17684957-f5af-42d6-abb5-c494d7043d1a/xukopaviderifokujijabole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396338ff-dfc2-468b-a3c9-22b98079cb27/xotuwajavolosavazelulato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9772b9-53ca-4a05-b3c1-c7165cbdef20/how_to_change_my_voicemail_on_my_lg_phone.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_be30464b546e4ea29e3a1d0bf8274809.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_1f95265fc6b64edda5a910110130fc0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e53f38-8501-4645-85d9-07b3da545621/17605153257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c1b29a-5328-4331-ba6f-c783cafe4e09/kononemisovufuvanadajuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4308f59-e7a8-4e8e-933c-96b77bd76af9/84238433228.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_off0001db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB1E 4624 bytes
SHA-256: 92c79f7e6d9169ea3da3d1ffe1836ed29a6eb7be2715b51e168a0d57bae263da
font_01_sfnt_off0001eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EADF 12500 bytes
SHA-256: c6ed9a9ca7c7f1b459cb5e071092f50c7c941a2cffdc118c27b46bbf237c95af