Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3b5acde3034a49…

MALICIOUS

PDF

85.2 KB Created: 2021-02-24 00:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c535dd14db336fdc827d4d3ca0338ee SHA-1: 4476c03cf3e08e1ccff8aec42f5096985d7e9363 SHA-256: 7f3b5acde3034a49177ac141ce9793125371e892c5149cea4d8b12267d4cf0f3
214 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a large number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, and another identifies it as a link farm. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=percent+ions+worksheet+with+answers+key In PDF document text
    • https://cdn.sqhk.co/raxoxawupej/fMwiihb/22694201330.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hcIcB35/tezirolalazigi.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/futepo-jevilomur-gasarelovow.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/ieieQvk/dolupamirazuzezufipake.pdfIn PDF document text
    • https://gerukule.weebly.com/uploads/1/3/1/6/131606739/muvadafodeje-patuzaxatop-dedenifak.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/zowirepudidiri_wobeviriro.pdfIn PDF document text
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/295015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bufexa/74680883403.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/lord_of_the_rings_extended_4k_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/5591631195.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/74869762764.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/despacito_remix_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/8285031804.pdfIn PDF document text
    • http://vumuvewegoseme.epizy.com/temajolita.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/zirigukum.pdfIn PDF document text
    • http://rorolavosi.rf.gd/51914970273.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/collage_maker_app_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/raminotonarodosa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 4904 bytes
SHA-256: b44e292b920ef9a5236e10743f9194718dc7181dacedbaf9b49c9513532967c2
font_01_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 11028 bytes
SHA-256: d929143d37b10d34e13f28de27846b89b2b9bbf04122a83eebef424a6f882dd2
font_02_sfnt_off00013749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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