Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca197fd1d8b3837…

MALICIOUS

PDF

94.8 KB Created: 2021-02-18 18:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 89fd23aab5396f96ba6320a8c886d316 SHA-1: c8c2cf3c82cb095c62af4436f32a3ff1b023564f SHA-256: 6ca197fd1d8b383726d90b9b5ae6dd2e903f4e90e8f4e704eeb359cf253577d9
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 pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=completing+the+square+formula+quadratic+equation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384463/normal_60299656db71a.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/6hgijjc/jusosuzosivu.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/291006927b.pdfIn PDF document text
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/7286140.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/HXjeWtD/where_to_buy_valentine_cake_decorations_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/gfLhihd/6631468341.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/sifova-migibitod.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/ifIJUij/jovalujejutuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417815/normal_6008f78d98357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_602d3d2315fb9.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/dalekaviwu_beverifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_602196c9bf96b.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/ugeijhe/81926663967.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/cpKeZMq/racing_fever_moto_unlimited_download.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/kizaziv.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/tebitelubuw.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/lords_of_dogtown_imdb_parents_guide.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010779.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10779 15688 bytes
SHA-256: ceadaf3e9bb74fe4152c911221e7e066cfd3bbc9de2ad1aab3a3eb6ddb1fbfc3
font_00_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 5600 bytes
SHA-256: 4a5c66b3ebb4bf9b0e4398700e4e87d6c36a61994caf03a61679021f1fd964ab
font_02_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 10976 bytes
SHA-256: 4c35552c14a39d243338161891b97bd5ee72774edf764519effdfda6ea102527
font_03_sfnt_off00015810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15810 16116 bytes
SHA-256: 16ec8717e79109bdf41b84b2d95e1e14a4025ba571ded87f7fafd23da5100dd2