Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9889ae278f74009…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 09:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1e8d3726ed224ef911a6c9aa94cbcb91 SHA-1: c18d8420f58fed1e454928f500b1e0218d452d89 SHA-256: a9889ae278f7400913f87e2c0199ccf1c9c8909d7dcf56d7bf961e3091f8bfbc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and link farms, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains fragments that hint at the lure used to entice users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=how+to+loosen+underwear+elastic PDF link annotation
    • http://bizarur.iblogger.org/40503136204.pdfIn PDF document text
    • http://itactical.xyz/vajowafiwanagilif15jgi.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/8GBjahd/final_fantasy_7_remake_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/09idDgc/29660022942.pdfIn PDF document text
    • http://cleaner360.shop/submissive_wife_guide_to_marriagec6pja.pdfIn PDF document text
    • http://lami-lashes.site/can_you_make_a_smoothie_with_oatswu2tv.pdfIn PDF document text
    • http://snt-br.ru/23159636776jbknk.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/hbGZgi3/92688677265.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/v9ibhbu/fogefirotefinufadikawari.pdfIn PDF document text
    • http://unonatur.space/fitbit_inspire_2_clipmu2bj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wesukudepabu.epizy.com/72555074743.pdfIn PDF document text
    • http://tenurusimuxu.epizy.com/pokemon_let_s_go_blaine_answers.pdfIn PDF document text
    • http://jenurinufaka.rf.gd/sexasekagadadoja.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/24648925043.pdfIn PDF document text
    • http://wesovipimamino.epizy.com/21726903781.pdfIn PDF document text
    • http://fadakivok.rf.gd/deruwutiziginudabunuvika.pdfIn PDF document text
    • http://mirepili.epizy.com/anime_slayer_apk_english_version.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 4868 bytes
SHA-256: 9d5a35cbd361c26805b4c62b7339f70ca318381e28d5101f3fe1eb0a4f5501bc
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10492 bytes
SHA-256: e3a47aa30ef07c0bbba5ed8944efb39bab57cda6a5e93e960968737dd1633416
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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