Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5fbe8952b59fce…

MALICIOUS

PDF

81.2 KB Created: 2021-04-05 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: abaa36a175a18e5e8dd8cdc3828276bd SHA-1: 333571478a2a152a67e4faf49fc37ade78e16d74 SHA-256: 0d5fbe8952b59fcec528042d211ff6129f657d2610d3e7bc00e874136ad18ccc
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, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=which+element+on+the+periodic+table+has+four+energy+levels+and+two+valence+electrons PDF link annotation
    • http://nuxuzuruguli.mypressonline.com/48514442202.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/bgjLjbl/tobiweg.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/kobalt_7_inch_tile_saw_reviews.pdfIn PDF document text
    • https://gafukarufigak.weebly.com/uploads/1/3/5/3/135309608/dapizewosid-tofogo-jetibabasedu-lunewuxenagukiw.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/jgijhij/keks_pay_enc.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/c398920d75fb35.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/tomotaxupulugibikameken.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/the_5_stages_of_relationships_everyone_should_know.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/kDSicgd/hello_neighbor_game_rating_age.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/iH8selN/16617096131.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/hzhejgH/zaxafo.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/92029166070.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/Gyhijfm/rex_sky_force_3d_settings.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/gofejajenute.pdfIn PDF document text
    • https://kusotabemeradu.weebly.com/uploads/1/3/4/8/134873971/pafagimak_jilikakemejop_fapanonajugisig.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/ceo._maharashtra._gov._in_voter_list_2020.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/ruwuvewat_vapelalafaf_simezoxozefu_koreduwemoramuv.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/2qgjJih/xotisaxuxedit.pdfIn PDF document text
    • https://fosezuwupilure.weebly.com/uploads/1/3/4/1/134132817/kilimetabijixidez.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/borokegujuzero/58946863498.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/alarm_clock_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/dofura.pdfIn PDF document text
    • http://lavapokapajemob.myartsonline.com/degradacion_de_suelos_agricolas.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_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 5976 bytes
SHA-256: c52c9934905fa61a8870decd9133ae0c7274a4c216ac61d23f00dce1a18ac2ed
font_01_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 10964 bytes
SHA-256: 7ac2271716a10733282759a892cc45b16bd6740d4c74afd8efcd6faf46a51228