Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a3c98d4c151330…

MALICIOUS

PDF

87.6 KB Created: 2021-05-04 04:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21531413814293215a05828917fb62e SHA-1: 93d885a8116630fba4a1eb1b2390fea9cd3f3b46 SHA-256: 07a3c98d4c151330245756f18575a9cbb9fd90bcf6b54b855d0c6101af1246b8
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The primary purpose appears to be directing users to a variety of websites, potentially for phishing or SEO spam. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=is+milorganite+safe+for+cats
    • https://cdn.sqhk.co/navuwamas/chahjbQ/instalar_age_of_empires_2_en_mac_steam.pdf
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/letedom_ranobigopugum_tesatozusulami.pdf
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/c121bf.pdf
    • https://gadujixefanupu.weebly.com/uploads/1/3/1/1/131163635/3298058.pdf
    • https://cdn.sqhk.co/gupukutolet/0Zwp2jf/can_i_forward_my_calls_to_another_phone.pdf
    • https://cdn.sqhk.co/gijimexuv/hn0jfjb/best_free_tv_series_website.pdf
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/bobopafesorop-jizuwosowuwel.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1161214.pdf
    • http://xogakijukutikep.22web.org/94541120695.pdf
    • http://gikepofazanapol.mypressonline.com/rakobiduxevadawa.pdf
    • https://xegubivagemegi.weebly.com/uploads/1/3/4/4/134481439/nenibemanugi_vewokifomub_vesamixaj_xolodunupu.pdf
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/zijusojitapanag.pdf
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/7312661.pdf
    • https://cdn.sqhk.co/lejesapazud/69hlSKI/gunedugunexuv.pdf
    • https://cdn.sqhk.co/gazegarov/cT28BHY/timeline_of_information_age_inventions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sipanokule.onlinewebshop.net/37419304211.pdf
    • http://tutakaxebi.epizy.com/94945232660.pdf
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_264917b9cdeb4e028fb2e37d9c19d1ae.pdf?index=true
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_12f5de2b20694eff8c7ae65c6e51e5dc.pdf?index=true
    • http://gakamaxoluzes.atwebpages.com/atorvastatin_lipitor_davis.pdf
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_140b18738a9746fb9a06b59ec61ac0f4.pdf?index=true
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_44e2ec9296d04781a7eae4934c2b78d0.pdf?index=true
    • http://lafanibawonol.rf.gd/baghban_movie_video_songs.pdf
    • http://logasizujonasi.rf.gd/microbiological_culture_media.pdf
    • https://f0ded7c6-1882-44c2-b580-3fd8daacf182.filesusr.com/ugd/1cd4ca_2f6309d43d284489ad9a967bfd72d1d6.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111b0.bin
086912b95d9f6c84f5b506a98766d8f575d03a80fbf7fdba13bd094e773aee3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 4928 bytes
font_01_sfnt_off0001224f.bin
6f26f06e2051e2f6aa81319cc4031bde71a9b1a7ccc8c9ca65c3ffe8b86b22b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 11580 bytes
font_02_sfnt_off000149c3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149C3 4324 bytes

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