Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8fdbcbec15737f…

MALICIOUS

PDF

75.3 KB Created: 2021-02-25 11:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c7790fdd56b26760bc4e29576204133b SHA-1: 654787a451fb565d5ea4e1281ccade4a52f74e9b SHA-256: ff8fdbcbec15737f7069b0f6b37ef11bf4ec1ab51787a593c872a77d98c4c164
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector link pointing to 'crophysi.ru'. Another critical heuristic flags it as a PDF link farm, with 24 external PDF links detected, including one to 's3.amazonaws.com/xakajoziwibi/chrome_linux_tar._gz.pdf'. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of links and the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/award?keyword=problems+as+opportunities+quotes In PDF document text
    • http://pozijuza.scienceontheweb.net/mitejajizide.pdfIn PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/vodasikaviz-legemeboruwaju-navojoxeliluzit-nasipafepevad.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/ujcd4hf/iced_matcha_latte_starbucks_healthy.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/gupurovazoge.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/xakajoziwibi/chrome_linux_tar._gz.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/jigipopafodurikipobarid.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/wondershare_mirrorgo_official.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/34546291559.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/sarag.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/personal_development_plan_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/online_marksheet_editing.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/dunajoxilujidu.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5232 bytes
SHA-256: c1a44db002da6aeea0598ec8a6fae9d7d9c6ecb8770c4c95a0c2a67c66e701e1
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10288 bytes
SHA-256: f05c58857b081f69996a571a9b80231a22775c430db5d8b6710207facaa7bcf3

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