Malicious PDF — malware analysis report

Static analysis result for SHA-256 99576647185ad823…

MALICIOUS

PDF

81.4 KB Created: 2021-05-12 13:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6c77093ff2293291c2fbef1e0bb5d2f0 SHA-1: 2bee986239f7b84d579a17e3617b87680eaef3db SHA-256: 99576647185ad823adea2a3adfff44e6a11b78feb7eb65f8be532e95af29534f
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, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

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://fokemale.ru/strik?utm_term=jesus+calling+for+christmas PDF link annotation
    • http://revershjtb.site/stc_1000_thermostat_priceu2wgy.pdfIn PDF document text
    • http://polikarmonolit.ru/sujuluzapisomilupobigav637c.pdfIn PDF document text
    • https://masulawumesomok.weebly.com/uploads/1/3/4/7/134716226/xozak.pdfIn PDF document text
    • http://jakartapro.xyz/how_to_put_music_on_ipod_shuffle_4th_generation_with_itunest47sz.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/wozatututog_jilomime_kibutenotemag.pdfIn PDF document text
    • http://idealica-co.site/android_police_free_appskrsfg.pdfIn PDF document text
    • http://gogogoinst.xyz/70242767677l4jsg.pdfIn PDF document text
    • https://tivaxuxilo.weebly.com/uploads/1/3/4/1/134131375/parimapokevite-magekeberesus-xamanoragif.pdfIn PDF document text
    • http://idealica-ufficiale.site/why_did_slavery_end_in_brazilj9azx.pdfIn PDF document text
    • http://iclod.tech/adjective_order_lesson_planbimuw.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/bijedilifax.pdfIn PDF document text
    • http://jopkapopka.online/xinumuzaredemovornf2ga.pdfIn PDF document text
    • http://goldstein.capital/96271405690q9u5v.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/45101806405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibofive.epizy.com/alcalosis_metabolica_en_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4990671e-c5bd-4ec4-940c-5c3d280b8916/67773229055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c526733d-8053-433b-bd3e-3a01569e1197/drawbacks_of_cultural_imperialism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f038e990-1605-430c-b6f7-e6acd91f4a93/oracle_pl_sql_nvl_number.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/gesture_controlled_robotic_arm_project_report.pdfIn PDF document text
    • http://terumalok.atwebpages.com/abon_bonggol_pisang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7b5fec-8bde-47ad-801b-79d1fdb78082/2011_dodge_avenger_3.6_thermostat_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded9413d-ff9f-46bd-a584-3481b218a9b3/rivubozigovixemenut.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_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 5284 bytes
SHA-256: dafee44fb5b9bb9243aad983f4e4d61d54191c0b703363893dd9fbd932d301e0
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 11960 bytes
SHA-256: 29f294479e7f6a1d3a66a6704899c771e98a431ce1d2a06e788c8e612bee7ee1