Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dde5f2178f5207…

MALICIOUS

PDF

78.6 KB Created: 2021-05-03 16:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfcc745701c354dd7cb316c0f04832e8 SHA-1: c4ee5ff1c2122b07d0bac71cb0bdac5994d20d3b SHA-256: b7dde5f2178f52071c4437c26c3da89b3cf6c398936239d0fddb6ef4872d0537
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to data analysis software, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=which+software+is+best+for+data+analysis
    • http://bawukafivawi.iblogger.org/fadimudafu.pdf
    • http://tegogigagozij.iblogger.org/52385239555.pdf
    • http://cashbackmoney.info/dajapujiwokomenst1qx.pdf
    • https://sutomoloxoxe.weebly.com/uploads/1/3/5/9/135986515/ruzatejavi-wimasuvuxegel-gidedezero.pdf
    • http://jiludedo.iblogger.org/55540618838.pdf
    • http://aromaita.space/calorie_counting_worksheethh47v.pdf
    • http://ditulut.iblogger.org/xeniwubidixuza.pdf
    • https://lupilizeranal.weebly.com/uploads/1/3/4/4/134460298/5747922.pdf
    • https://bitugibetofovo.weebly.com/uploads/1/3/0/9/130969362/59fae757ef0cb8.pdf
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/nodolegixijagaxe.pdf
    • http://jepekimeba.iblogger.org/61411906205.pdf
    • http://zabidegelid.iblogger.org/cha_cha_line_dance_step_sheet.pdf
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/nufopozuvipaza-tukamut.pdf
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/090838e6d8c.pdf
    • https://ziloboze.weebly.com/uploads/1/3/2/6/132683463/mulolu.pdf
    • http://powerhdniy.space/95834462398jq935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://menivafanar.epizy.com/vistaprint_standard_postcard_template.pdf
    • http://vumavoralamo.rf.gd/gafuxejabajozanaledapifi.pdf
    • http://xafonabikox.rf.gd/guinevere_mobile_legends_build_guide.pdf
    • http://lodaxiku.rf.gd/allah_waariyan_song_free.pdf
    • http://waboxizolomove.rf.gd/aap_se_mausiiquii_video_song_mp4.pdf
    • http://xisapedugifado.epizy.com/coupon_template_psd_free.pdf
    • http://figavexujofivu.rf.gd/nekupekekiwalarigavej.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_off0000f2a0.bin
70ba330a0148ccd4081e939648b0c764f6b5fc8c30881e66fc1f0226bee70ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5456 bytes
font_01_sfnt_off00010546.bin
772f5ab9b78cc1a36973d71ed3689f2699bad233f239eff14239ffb0455a314f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 11888 bytes

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