Malicious PDF — malware analysis report

Static analysis result for SHA-256 8561427959c2bdb4…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 20:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fd876dabc97af51853ee1559ab21f570 SHA-1: 2e3fbf797654893628bbc7410f56213d5652cedb SHA-256: 8561427959c2bdb479aaa56abf9379fca972846def1913f8a04e0b9853c981b1
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 SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=work+energy+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/xuvomuvugu/VhMidhe/47964670024.pdfIn PDF document text
    • https://bijejosuti.weebly.com/uploads/1/3/1/6/131637047/besoxamajirop.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/fokexovuzefowek.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/EsibhfO/56561677324.pdfIn PDF document text
    • http://latujor.22web.org/acuerdo_041_de_2020_cartagena.pdfIn PDF document text
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/3636012.pdfIn PDF document text
    • http://metaleagle.ru/lewamozuperufukaojm11.pdfIn PDF document text
    • https://cdn.sqhk.co/zowegifivufo/MAZihij/ecological_pyramids_worksheet_answer_key_pogil.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/4080cc348342e.pdfIn PDF document text
    • https://lonumuzab.weebly.com/uploads/1/3/4/2/134234730/rixasut.pdfIn PDF document text
    • http://frasqen.online/honda_hr215_parts_diagramivbms.pdfIn PDF document text
    • http://aycotoro6.xyz/sopidetogagagoiqms5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawekipabotore.epizy.com/exclude_classes_from_jacoco_report_gradle.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/24569628073.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/pubg_lite_pc_steam.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/jitexalibube.pdfIn PDF document text
    • http://ruwevabebivis.epizy.com/14414961854.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 5332 bytes
SHA-256: a219f76575b7a380c8cb3d7ce8964db7eb88eb3332f1d4a1981466460b14ef11
font_01_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 11104 bytes
SHA-256: faeee7b45d8387e0a2c3f10bb95b0f300c7954e085dc50232a42701c5dea2c5d
font_02_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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