Malicious PDF — malware analysis report

Static analysis result for SHA-256 5581c2001a8efab3…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 16:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba300bcab0d446c7d659120743721dc8 SHA-1: a6d24bc2d6dbbce4253ea65ce33ff58f810f0416 SHA-256: 5581c2001a8efab39e52971f1be32e926107a90d1589550460943ffe88758405
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'https://baarspo.ru/wix?keyword=the+godfather+returns+novel+pdf', suggesting a phishing or SEO spam campaign. The heuristic 'PDF_SEO_LINK_FARM' further supports this, indicating the PDF is part of a larger effort to generate traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=the+godfather+returns+novel+pdf
    • http://duwosolutanuz.mypressonline.com/kipuludufa.pdf
    • http://junumidutuzakox.getenjoyment.net/16715488439.pdf
    • https://cdn.sqhk.co/wubunepan/ehchfhO/sudunulokujat.pdf
    • https://cdn.sqhk.co/burajugi/PiihhPl/destination_b1_answer_key.pdf
    • http://suzofovolavuk.scienceontheweb.net/40212568846.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bizamesuwepe/blazor_webassembly_template.pdf
    • https://s3.amazonaws.com/vovopafubipu/bosch_tassimo_manual.pdf
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_ed489b7693564afea8484d564d67e4f1.pdf?index=true
    • https://s3.amazonaws.com/lakujusitejojet/la_belle_au_bois_dormant_grimm.pdf
    • http://dowuvoduwitovos.atwebpages.com/19080979090.pdf
    • https://s3.amazonaws.com/nazekisigiduz/51749679677.pdf
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_625b8b7efdd14b15a9033c6fa543027a.pdf?index=true
    • https://s3.amazonaws.com/zesotat/thinking_maps_double_bubble_template.pdf
    • https://s3.amazonaws.com/jaxesabi/behold_the_lamb_of_god_chords.pdf
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_09f16f3e7304471e8038b64f94acd4c7.pdf?index=true
    • https://s3.amazonaws.com/xuzed/soleus_air_70_pint_dehumidifier_not_working.pdf
    • http://memamawu.onlinewebshop.net/jizametasatirerogikikifi.pdf
    • https://s3.amazonaws.com/ditiruz/canonical_transformation_and_generating_function.pdf
    • https://s3.amazonaws.com/lorifawuvawot/87974486634.pdf
    • https://s3.amazonaws.com/mutirexa/bisunem.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_off0000f046.bin
a2d03b73023976661efba5724bfeaae5bae6feaf79d33a0c157adb128c2454fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 5312 bytes
font_01_sfnt_off00010264.bin
97db812bec196481b205f84a6472ad9c7a0303d8f92cb3aa2d28cad63ff8bedd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 15120 bytes

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