Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0551e5a2d3e48…

MALICIOUS

PDF

73.9 KB Created: 2021-02-28 21:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 522dfc5bd520badb6e1b16fcedb2c0db SHA-1: 2bac16ba3d2114aa8a6aca44324cefb992a29d54 SHA-256: baa0551e5a2d3e486f1acccf1d7bd336c9cc398d3051204945b80635a14c7230
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with several pointing to disposable domains and one explicitly identified as a link farm. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

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://midufefew.ru/strik?utm_term=how+much+does+d+and+c+cost PDF link annotation
    • http://christmas-gift.ru/saiva_agamas7xb8g.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/60330900618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fef4af84e78d.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/1292228901.pdfIn PDF document text
    • http://3bki.ru/arcore_apk_modmqwq4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5fc8c68e670f4.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/have_tesla_prices_dropped.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/the_lady_with_the_dog_theme.pdfIn PDF document text
    • http://neyroskakalka.site/besame_mucho_fingerstyle_guitardcwjs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_6014c07080c4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_602fad582b0e1.pdfIn PDF document text
    • http://prod-fruit.space/lyrics_seven_years_in_tibet_david_bowie9hu88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/futamo/simile_and_metaphor_worksheets_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/bamumoze.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/aggiornamento_android_su_wiko.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 5104 bytes
SHA-256: 1ecabbcb618f4dad5d62ed9f0e5ec607412b6417850a2fe338454dc8cab818f1
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 10264 bytes
SHA-256: 60dfba644927388adf3ebd7978bacd9360b1eca8b86aa0f8113293f07ebd0126

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