Malicious PDF — malware analysis report

Static analysis result for SHA-256 6affc698396066cc…

MALICIOUS

PDF

69.9 KB Created: 2021-03-27 21:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fbeaa00b7e14bf4dec5c2fc087b65ab SHA-1: bf06a3f25b1fade6628178e28229316ca705c941 SHA-256: 6affc698396066cc199e021f0e9c97bc654744c4733ff7bdbc81b5cc3129d481
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or spam campaign. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to generate traffic or distribute further malicious content. The presence of embedded URLs, including one pointing to 'druttle.ru', reinforces the malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/wix?keyword=chapter+6+frappy+answers
    • https://static.s123-cdn-static.com/uploads/4390057/normal_5fdcb8e734ec9.pdf
    • https://cdn-cms.f-static.net/uploads/4468531/normal_60364fc0825df.pdf
    • https://cdn-cms.f-static.net/uploads/4405903/normal_601a2c250d403.pdf
    • https://muwilumi.weebly.com/uploads/1/3/0/8/130813533/3558261.pdf
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd7894ca7d17.pdf
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/7792100.pdf
    • https://witaveju.weebly.com/uploads/1/3/1/4/131452735/fobelodutop_suvotedabokopux.pdf
    • https://cdn-cms.f-static.net/uploads/4388841/normal_604da785aa2e7.pdf
    • https://jeputuzomum.weebly.com/uploads/1/3/1/3/131398597/jiparipuwigagabimu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_d827f2c42a7e4db9bab5e055698786d0.pdf?index=true
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_baa302002c1e4ff393b438e537a769c3.pdf?index=true
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_43262ec12aa84beab913c0dfa780f866.pdf?index=true
    • https://s3.amazonaws.com/zalomi/tepodox.pdf
    • https://s3.amazonaws.com/nigimul/xikoxo.pdf
    • https://s3.amazonaws.com/dubiditiginowo/wafugufogajosiluwizu.pdf
    • https://s3.amazonaws.com/jasadavebaga/bharat_movie_trailer_3gp.pdf
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_b6a50b372b8b4b77afe0b8fec3ca768d.pdf?index=true
    • https://s3.amazonaws.com/fusopoxipo/80676811182.pdf
    • https://s3.amazonaws.com/najubu/ofsted_report_lydiard_park_academy.pdf
    • https://s3.amazonaws.com/gawabog/vidmate_2017_play_store.pdf
    • https://s3.amazonaws.com/penale/tijujekese.pdf
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_7af626ffe43a4e44baf999d167ec023f.pdf?index=true
    • https://s3.amazonaws.com/zonebon/15300181082.pdf
    • https://s3.amazonaws.com/dogazisuze/galvin_green_paclite_size_guide.pdf
    • https://s3.amazonaws.com/jazuravazaguz/kivagiletepule.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_off0000d34b.bin
c07ec59c99153c7571504f11c76bc079ed730afd98fb1eabcbf31bdc890a6c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 5212 bytes
font_01_sfnt_off0000e51a.bin
4f62cb272bedab6edf715f81812666a133bc619e872b8b238240b8cef2dbc1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 10940 bytes

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