Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a71da97be657413…

MALICIOUS

PDF

71.8 KB Created: 2021-02-11 05:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d7c3d4b9f872a6ec2067b9abd6754b79 SHA-1: 895faea5fee221f449f8b2d6a8204a386a72f7f9 SHA-256: 0a71da97be65741396932fe7f4b76e2060f9010adbfeebe2ee395dfcdd83f394
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO farms or to redirect users to malicious sites. ClamAV detected this as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as highly malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a phishing or malware distribution site.

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 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.
  • 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://druttle.ru/123?utm_term=academy+broadway+cabin+tent+instructions PDF link annotation
    • https://cdn.sqhk.co/velabolo/jdhaNGO/military_drones_flying_at_night.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/2742868.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/jglgcih/54289001836.pdfIn PDF document text
    • http://vapideloni.22web.org/website_layout_psd_template.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/idjeSui/tavilubikamevug.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/gihiYXp/bagaribuvagasovixigi.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/idJkhfY/15354208404.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/LakTChf/binasovafeb.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/eBBPCTe/sujudifejigi.pdfIn PDF document text
    • https://cdn.sqhk.co/tamikoveken/gghd1hg/egg_inc_game_center.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/ihjjhid/xozugoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/Ui8dibD/9206048750.pdfIn PDF document text
    • https://cdn.sqhk.co/kojanakif/ih8VFGe/loxumevebowimazapoxolig.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://fewetero.epizy.com/rizeda.pdfIn PDF document text
    • http://nesuzilusuk.epizy.com/glycemic_index_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 5260 bytes
SHA-256: 0639fb0ddde74a5c705c9d4d3d0047b9ae5397023622e8fbd7f770188e870754
font_01_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 10448 bytes
SHA-256: 7458448e963e2512cf156abd1a5d6834cbc1bc2255ace147a5e6de07525bcd88
font_02_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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