Malicious PDF — malware analysis report

Static analysis result for SHA-256 b519b956e7efec84…

MALICIOUS

PDF

75.1 KB Created: 2021-01-02 04:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 06a766d49d9ee39f85b76ee61502b9ec SHA-1: 534dc70d2cb78f1e78167a4e59c5e45c1ec1c833 SHA-256: b519b956e7efec849de2cdeb3a366867d060deaaf401ab4c14b246795f04b284
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to attract search engine traffic, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://trafficel.ru/123?utm_term=abnormal+psychology+comer+8th+edition+pdf+free+download', suggests a lure related to downloading a textbook. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafficel.ru/123?utm_term=abnormal+psychology+comer+8th+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/wefenosefob/hjihRFY/88565737438.pdfIn PDF document text
    • https://nuxagaselupig.weebly.com/uploads/1/3/4/0/134016775/1619516.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/hjdZgMu/55838847354.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/njjcTeY/rolling_stones_cheetah_tongue_t_shirt.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/a18ed2eb-56a6-43f4-bbf6-40fc384087ed/go_karts_for_sale_near_me_by_owner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fac839-bb7a-4a21-9b9f-b86ea443402e/troy_bilt_tomahawk_chipper_shredder_8hp_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9185a22d-e15a-47aa-91b1-deb075e85976/car_racing_3d_game_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c04463-7cdf-46f2-9c13-9cf9ce079b61/lunuxibofufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a712e28f-9a72-4ea4-a0d1-0a47e3af00d4/estampados_y_bordados_ponce_income.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef38abf3-7cc0-45ea-b3fe-5328f5f9197c/l_g_van_ng_mch_ch_trileaflet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada49c85-9afd-4cdd-bd5a-be13b7149837/saint_rita_novena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f058d9-8af1-469f-bb96-45b1f95f100d/92879639555.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 5872 bytes
SHA-256: 873185b5e5286a67d605a8f957dcfd7f607ac697b3932d81222659645497a5ec
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 11468 bytes
SHA-256: 7af020e696a424c41ff08f6d8e7c9f2a935acfb1de5d14692efa71eea90bc400
font_02_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.