Malicious PDF — malware analysis report

Static analysis result for SHA-256 687761b358ef5260…

MALICIOUS

PDF

72.0 KB Created: 2021-03-15 12:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b17652971e694aaa65140c3aaa3e3c76 SHA-1: 947d1a7a222eacfef9e205dbafdb86757a44d25f SHA-256: 687761b358ef52604f779474b7fa0ac59627921fee254bde713f9050d9f0f200
284 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'dirt devil power max' belt replacement, likely to trick users into clicking the malicious links. The presence of multiple PDF links and a critical heuristic firing for a malicious redirector strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+replace+belt+on+dirt+devil+power+max In PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/900d96e7b1bbc9c.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/how_to_drain_radiator_2002_chrysler_town_and_country.pdfIn PDF document text
    • http://bagezokazuraw.medianewsonline.com/ignou_solved_assignment_2020_free_download.pdfIn PDF document text
    • http://itsnat.space/how_to_harvest_peanuts_at_home8m84f.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/2565422.pdfIn PDF document text
    • https://logesili.weebly.com/uploads/1/3/5/3/135389335/cdc625fd651.pdfIn PDF document text
    • http://momarivido.mypressonline.com/dawobupovapabanoku.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/9c8b6f5c042f3.pdfIn PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/runeses_tavozetenozi.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/punasiduz.pdfIn PDF document text
    • http://www19216801.site/sodegegusejo3urs8.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/vosifedemu.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/8188955391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gojonilitipowo.rf.gd/witcher_2_ps4.pdfIn PDF document text
    • http://zazupixuwup.rf.gd/xitixadekitibixosarivi.pdfIn PDF document text
    • http://xelidamos.epizy.com/amnesia_memories_trophy_guide.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/dollhouse_fashion_australia.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/test_your_english_vocabulary_upper_intermediate.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/75443611402.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 5360 bytes
SHA-256: bac297353212e674196026a35fd297985054dc5abb10b6291b32f8d4b8952344
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10416 bytes
SHA-256: 8ee086631f763a32354f628eeb938541c44b8269902911e9bedfcaed46f96768