Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfce3cc2e75b735…

MALICIOUS

PDF

74.2 KB Created: 2020-12-17 03:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e38553130d8a1528318d408e4f98be58 SHA-1: 188e3ccf6ca0bf22476ab0c271f9b2a2e63a5b59 SHA-256: adfce3cc2e75b735980a5257caf27238af29795626ea4b9343936a89a7a3e845
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Ir spectroscopy problems with solutions'. The presence of a malicious redirector link and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=ir+spectroscopy+problems+with+solutions
    • https://gebedevalofibut.weebly.com/uploads/1/3/4/3/134379687/dazopinekuro.pdf
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/7617637.pdf
    • https://jakoxizejibak.weebly.com/uploads/1/3/4/3/134348863/3914763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gumagabu/best_warlock_leveling_spec_vanilla.pdf
    • https://static1.squarespace.com/static/5fc70c64f2297e36a9fc4e22/t/5fd6f15ee5ac58289636cc03/1607922015223/6106245055.pdf
    • https://uploads.strikinglycdn.com/files/e7b2ca66-7add-4003-b1d5-2e4605b05bb9/papa_louie_pizza_attack_game.pdf
    • https://s3.amazonaws.com/vukumesoj/fofitigonama.pdf
    • https://s3.amazonaws.com/remufuzu/livros_aprender_frances.pdf
    • https://s3.amazonaws.com/gudukupir/zavamavibenilore.pdf
    • https://static1.squarespace.com/static/5fc64bd4084698658e8310f1/t/5fc77b0d4f9413233b230f65/1606908685987/pixelefipolezonukoladuxes.pdf
    • https://s3.amazonaws.com/bulikowexunepov/ipcc_report_2018_criticism.pdf
    • https://s3.amazonaws.com/xanebavifamopez/bankers_adda_current_affairs_november_2018.pdf
    • https://s3.amazonaws.com/zopenave/jurassic_dinosaur_carnivores_evolution_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cb.bin
320dfbc5643a2db08a04229e648b1895fa7819b00f494c2f019257af8a5a81d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 5116 bytes
font_01_sfnt_off0000eb12.bin
1c8205b302577d4dee7c0a32b1f08b6e5b7cf940cee56eea3a80c31aa4b9c23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 10120 bytes
font_02_sfnt_off00010d7c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 4324 bytes

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