Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38bbbf14ded062d…

MALICIOUS

PDF

82.7 KB Created: 2021-04-15 06:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b773709e94bb0ae91292b4f619f9d258 SHA-1: 8f0a037998ab8e498186b009061ff2a374e4f723 SHA-256: a38bbbf14ded062d18b25d6f71b3d7a387dfc27f4576014f1b6a0608b3edf0e7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://pelibifir.ru/strik?utm_term=make+analog+synthesizers
    • http://nosixavol.sportsontheweb.net/tokemazexukan.pdf
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/5348905.pdf
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/237f2d9ee6df6c.pdf
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/muxizijoxudaxuzobudu.pdf
    • http://vawurabel.mygamesonline.org/90708257085.pdf
    • https://zesuloni.weebly.com/uploads/1/3/4/8/134892945/raxonubog_fuguxu_vadolumelesefip.pdf
    • https://static.s123-cdn-static.com/uploads/4404520/normal_5fcf418a152e8.pdf
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/6379b.pdf
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5ffa003a35adb.pdf
    • https://rativebexatu.weebly.com/uploads/1/3/2/3/132302992/4024769.pdf
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/6897925.pdf
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/9193f18f.pdf
    • http://favodokoleti.mypressonline.com/used_dirt_bikes_for_sale_on_craigslist_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d305ef6-32b1-4572-a31f-ac49678bedd7/remirorupuju.pdf
    • https://uploads.strikinglycdn.com/files/0209f388-eb8e-4c89-91c3-ba0356006b08/subomufoda.pdf
    • https://uploads.strikinglycdn.com/files/6d1ad305-9720-4baa-a201-ac81d1fe311d/nilazuradufusuxul.pdf
    • https://s3.amazonaws.com/gedexim/babylon_berlin_staffel_2.pdf
    • https://s3.amazonaws.com/jixerubowi/72659534920.pdf
    • https://uploads.strikinglycdn.com/files/7159dd6e-bc43-4892-b8f9-e0be391663aa/87094778092.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_off000107ab.bin
f7d64ed7a1a0eb9d20e1a30dbf46e3c7cd40225731a27a3ccbfb9e5150af2ef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 5168 bytes
font_01_sfnt_off00011956.bin
d0f35354e319818431da5926a0fa6709d98a76a9a5492f0c43acdba3c42ad162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 10700 bytes

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