Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07deb11a3caa13c…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 15:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a8a703625b5e6ff37545e311aea6bb1 SHA-1: 081b0682d3a2fcaf2f59956158e1abcdb16606be SHA-256: f07deb11a3caa13ca1989d94c8980e93c2bbb781d280a9af021429a7143ceb07
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://jumiwimov.ru/wix?keyword=peter+built+the+church+song', is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, includes the string 'Peter built the church song', suggesting a lure to disguise the malicious intent. The presence of multiple external links and the ML classification strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=peter+built+the+church+song
    • http://info-pages.ru/49977422142w3x59.pdf
    • http://load-bcp.com/nepesebugunokirufuzajcgjx.pdf
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/8262834.pdf
    • http://gloslides.com/fizixefuzorasoxufatewikirv816f.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/3195183.pdf
    • https://kapukafasid.weebly.com/uploads/1/3/1/4/131437878/temuwivelupejumebe.pdf
    • http://waystep.site/gifafaxigilulojovunojiwuzjmkk5.pdf
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/titib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/somisilegex/91571908741.pdf
    • https://uploads.strikinglycdn.com/files/97d7ec20-5cab-48cc-ba64-d80e5fdcb797/which_came_first_christianity_or_judaism.pdf
    • https://uploads.strikinglycdn.com/files/b326c733-81c9-417d-b435-f08ae2c097e0/oregon_washington_state_basketball_prediction.pdf
    • https://uploads.strikinglycdn.com/files/0712de1d-bce4-4455-ab23-203ae8ffcdbf/pakakimazu.pdf
    • https://uploads.strikinglycdn.com/files/6d1b17a9-fb1d-4ee2-8abb-bd4644675c94/zadiwelatagifubobipefi.pdf
    • https://s3.amazonaws.com/devuxuzejozam/11_point_river_fishing_report.pdf
    • https://s3.amazonaws.com/piradi/how_to_bypass_liftmaster_sensor.pdf
    • https://uploads.strikinglycdn.com/files/866ce750-f008-4ef9-a0b7-a7c310b4cb8a/64939218514.pdf
    • https://s3.amazonaws.com/jigezilor/reasoning_questions_and_answers_in_hindi_blood_relation.pdf
    • https://uploads.strikinglycdn.com/files/b0e1a0ce-253b-441f-bc01-b31bed45880f/tabowenugefetok.pdf
    • http://bosadubarelazu.rf.gd/96772663116.pdf
    • http://labireninofut.epizy.com/web_banner_templates_psd_free.pdf
    • https://uploads.strikinglycdn.com/files/aee293cb-4843-4f6f-b3bc-cb8207920be0/instructions_for_sony_dream_machine_clock_radio_icf-c318.pdf
    • https://s3.amazonaws.com/posaxugidut/58631665787.pdf
    • http://jelazub.rf.gd/espiritu_de_dios_acordes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b7.bin
14a767f100650cd8bb6e25a8ff29555a5ac1dd1fedb7738eaa6ef899b7feb8f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 4992 bytes
font_01_sfnt_off0000f5ad.bin
8fb89550dcc6ecd35e82391bc9c83ed69e9ada96d77b109ebcf41ebb18b28539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 11076 bytes

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