Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aff647161cd660…

MALICIOUS

PDF

66.0 KB Created: 2021-03-03 02:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2a734f8f70963aeed32c760dcce9d6fb SHA-1: 5d74a572c227fe00c960a591b0c61a5f3e405aee SHA-256: 31aff647161cd6600d2f26a4da58df15f6f8cf965d0caf128e61951bfc0617da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/wix?keyword=miller+ranch+the+stockman+trouser PDF link annotation
    • https://cdn.sqhk.co/gixelotopa/ighh8hg/gozokipesevakage.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/e01jehg/minur.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/relation_and_function_definition_in_hindi.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/jiigS7Y/37234410987.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/WibDIB7/yeet_meaning_origin.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/iggjtge/7089040979.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/gd7aibV/cooking_dash_chateau_creep_season_4.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/long_john_silver_coupons_family_meal.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/girodolonelu.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/78353073065.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/1bNIEhj/worarutovufavikuk.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/iagiige/69488203873.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/rijibav.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/la_ciudad_y_los_perros_english_subtitles.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/banula/4470566930.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/magnetism_worksheet_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/luremofuwodomuvozike.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/3892757269.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/41290660576.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_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 5108 bytes
SHA-256: ef89b1f13f5f21bac521f3f55ec115fe1adb0378f39f0bc72c5ec6b8d911cd58
font_01_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10204 bytes
SHA-256: 75ff43852fb139a1eb64d7869cb4ea32b0094030deb7c5d2292db4f1ad5b68da

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