Malicious PDF — malware analysis report

Static analysis result for SHA-256 589b5f88fb42f777…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 02:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 76931192c4913bff5c4e184c42e08073 SHA-1: 819a569966ee2e573458f59a916f617c35170f1c SHA-256: 589b5f88fb42f7777a0199826d8bcd7f49c1447fbd9522435576235e3377d92c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://druttle.ru/award?keyword=definicion+de+movimiento+corporal+humano+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385862/normal_600edbae70770.pdfIn PDF document text
    • http://nesobaka7.xyz/nijapajizinidezofosepikinu36me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_602478ae9e9c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_604d8a40e0556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fd1910601434.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/2013_honda_civic_service_due_soon_b1_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_604357fb1874c.pdfIn PDF document text
    • http://kersita.fun/etap_cable_library_downloadw5qqc.pdfIn PDF document text
    • http://instapresent.site/nemufovexuzewoccyef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_6014bbdcc3a6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490375/normal_5fcbf23ac13b4.pdfIn PDF document text
    • http://lamovingcompany.com/how_to_reverse_engineer_a_gamemexg4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5fcf673db230f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_60347aafc91b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_6009a14f5d84b.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/philosophy_of_social_science_degree.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/da78488b-9074-4e84-b51f-398126a7f761/xijofobiruzefotorela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa7be57-3efc-44f8-b0cb-db49392a265e/67774361640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0eac928-5e9a-4680-959e-6c955943fc31/08_dodge_avenger_tire_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761628c0-3cbc-4141-89a3-169014acb21d/26764057953.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/wedding_march_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71c9a3f-bee1-42a0-a51b-32e38126f92d/the_sandman_movie_1991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ec2c25-83e9-4f46-9533-31bbd2aee609/27813787685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58767ea-72bd-4fe5-b1a1-0b2f92f47b36/92586697588.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 5276 bytes
SHA-256: ebf06734dbf606306b39731dca4d4bd47a67b74d49d13bba2d2a2ee4bd92fa38
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 12084 bytes
SHA-256: e5d7ef684e57e770dbb245152e9340e92953c59bc617de68901c4a4363d268b7