Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff57cf565acbfdc5…

MALICIOUS

PDF

77.0 KB Created: 2021-02-21 14:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c95d4094bed51364f0a336e2cf41fe3 SHA-1: fa9934cc3ae7a235220443ce9e7e3bb5e696822e SHA-256: ff57cf565acbfdc56ffc0565b5f9b3d8bf82eb272fbba6a6ca7796cdfc1243aa
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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.
  • 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.
  • 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/strik?utm_term=commanding+your+morning+scripture In PDF document text
    • http://werategaxa.iblogger.org/97399803835.pdfIn PDF document text
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/bopojavedod-galot.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/60b073fef.pdfIn PDF document text
    • https://pufodafu.weebly.com/uploads/1/3/5/9/135959320/c453d587.pdfIn PDF document text
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/xunidumudutam.pdfIn PDF document text
    • http://sumagezemorewo.22web.org/ibm_spss_amos_22_free.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/xidedu.pdfIn PDF document text
    • http://bogavevi.22web.org/kagodekakukipuvufopirul.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/fuzizimorozegig-bonus.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/muzamebobo-zivifemamevaw-papomunobenik.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/dagasopones/system_acceptance_test_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/sawamupesotutederiru.pdfIn PDF document text
    • http://tegemikewik.rf.gd/ketokesafu.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/boxujedoremev.pdfIn PDF document text
    • http://gebibem.epizy.com/comic_papyrus_font.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_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 5368 bytes
SHA-256: 93fc3424b2c8d29c51c6c041b0da73aa5eec2b8770d94f1eb525076f7af6cca4
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10360 bytes
SHA-256: f8e4e20ff3bfe6e3a36571f67f5bca4edc9b4225ab405263a42a1d67ea62af28

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