Malicious PDF — malware analysis report

Static analysis result for SHA-256 921674a94f342735…

MALICIOUS

PDF

76.1 KB Created: 2021-05-29 20:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1aa4ad063cb8e43ac632b12af299e276 SHA-1: a07dca08f588e3bea0f134ddc0626aafa74495d3 SHA-256: 921674a94f3427359e3467ae8bd3daa4e6474954dbdcf141060db4d433984ef8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'free barcode reader app for android', indicating a lure to entice users to click on these malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jumiwimov.ru/strik?utm_term=free+barcode+reader+app+for+android PDF link annotation
    • https://rosolovok.weebly.com/uploads/1/3/4/6/134687291/wunoselikiruti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_605c98fea000d.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/2073219.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/duvul_tomobowisumabad.pdfIn PDF document text
    • https://migerele.weebly.com/uploads/1/3/1/4/131453560/7507828.pdfIn PDF document text
    • https://fejufawos.weebly.com/uploads/1/3/4/3/134328201/4746093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fe32d2d0cd1a.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/225fd6.pdfIn PDF document text
    • https://welajelozasap.weebly.com/uploads/1/3/4/6/134695810/dibebisitabozodoli.pdfIn PDF document text
    • https://kobuvenaxoz.weebly.com/uploads/1/3/4/7/134762740/a1eade4ad432f3.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/5d4f6c495d2be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5fcf1fdf35001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5fe7e12edd726.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/8642977.pdfIn PDF document text
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/xabebawaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69625e9e-939b-40aa-a424-030b4479f0a3/voiced_and_voiceless_consonants_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c100f49e-2e50-4166-867a-cc92cf1077e8/xufole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3a045b-351e-439c-af9d-15c765aa38a7/eriksons_stages_of_development_definition.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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 5032 bytes
SHA-256: 816baf2e28c5f5710a998fc66300ed5b3b3676a6da9bf24406bbc47e707e9f25
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 10932 bytes
SHA-256: 46f2dd2bfb0ec1a6e3c81c2a49865841390663541ceddc6213470bb8a3f377ec

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