Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20fcf7bb4a8ecfb…

MALICIOUS

PDF

76.0 KB Created: 2021-06-05 15:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 75c65c5d23684a29da0b3e9ead378f8b SHA-1: 533fc3d0effc397cea534e45bf5b123a8198ce56 SHA-256: a20fcf7bb4a8ecfb43638f661085f63f18130f63b1400dce4596762ce23f5e7b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. 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 numerous external URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/pbw?utm_term=rihanna+love+on+the+brain+mp3+download PDF link annotation
    • https://beginuvemosuso.weebly.com/uploads/1/3/4/6/134699988/4226269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_5ffcde90ca750.pdfIn PDF document text
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/telekamudogaje_wimetisijez_nibafugez_roradinolixu.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/6305ffd0fa.pdfIn PDF document text
    • https://gajunepaki.weebly.com/uploads/1/3/4/7/134717041/1184724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5fd0b63bdbdf7.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/4a0ce4ac9852695.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/zipeg.pdfIn PDF document text
    • https://xuzumuja.weebly.com/uploads/1/3/1/6/131636792/mojilimegir.pdfIn PDF document text
    • https://nujunilotup.weebly.com/uploads/1/3/4/6/134642651/5370431.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/pelit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60117c33bf9e7.pdfIn PDF document text
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/bodab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461748/normal_5ff4380c0c895.pdfIn PDF document text
    • https://vejisiwitize.weebly.com/uploads/1/3/7/5/137515314/9491347.pdfIn PDF document text
    • https://zobujonewuw.weebly.com/uploads/1/3/5/3/135389851/bisaretukup_sumudikoli_ravanibugo_fegekutaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_605abe629acaa.pdfIn PDF document text
    • https://xokijawajix.weebly.com/uploads/1/3/4/7/134726357/0c63faab.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/a5e1b53df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ff4efc-77e5-4e2a-bda3-f9e9cd82f939/how_to_activate_conlog_prepaid_metre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6425d044-158d-48da-a9f3-bf1ed466b1fe/74990029237.pdfIn PDF document text
    • http://mutatalibo.pbworks.com/w/file/fetch/144427497/koreledaxokejafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cdca49-39c9-450c-845f-f92dcab0c2b7/temoripupetejesaw.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/w/file/fetch/144660315/b_oxidacion_de_acidos_grasos.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 5484 bytes
SHA-256: 9456ad2714431d91b8c30f72cc83c830f4c320e3b1ffeb6d3144697f9c3ace07
font_01_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 12560 bytes
SHA-256: 2553316c713936ec48cfb9bcebd82461c72b0bb2509464ed41017f04da1dcafa
font_02_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 18268 bytes
SHA-256: 4062eb67fce4d20e21f9de03e79d118684229c16362ea434ed1e275e4bdff486

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