Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f0b182d7f75b59…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 00:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b9ea21db5b7c086ad91248583cbf4938 SHA-1: 086d511dd82920fcbebb7a9b46c2cfa3b94386a6 SHA-256: 71f0b182d7f75b59880cee9a7af92f746e76b9394432206faca67e7ab3b54ab7
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://fokemale.ru/aws?utm_term=bash+script+add+variable+to+array', appears to be a redirector that could lead to a malicious payload or phishing page.

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://fokemale.ru/aws?utm_term=bash+script+add+variable+to+array PDF link annotation
    • http://lodorobirat.22web.org/gixoxebepenanarusitab.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/tavozoz-xivubokavelova.pdfIn PDF document text
    • http://ziwotixog.22web.org/12702106027.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/2880147.pdfIn PDF document text
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/mopijudi.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/kaduxefaw_zedamurafemi.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/9497964.pdfIn PDF document text
    • https://winudepawo.weebly.com/uploads/1/3/4/1/134132470/4832911.pdfIn PDF document text
    • https://pabixiwirixe.weebly.com/uploads/1/3/1/0/131071256/5760431.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/6d6a17f7-29ef-4cc7-82f4-a77bc44bcde2/banugedozuwufasir.pdfIn PDF document text
    • http://boludit.rf.gd/92278635581.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/81319030103.pdfIn PDF document text
    • http://movisupe.epizy.com/fegurigabo.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/exumas_sailing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa62b3fc-50fe-4d85-9aa5-ec102cc963c8/70764996328.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/gixajul.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5512 bytes
SHA-256: 0c8673d025ea54ae3ec423b99221693714e810959de148d69fdda5c7a33feb96
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 12164 bytes
SHA-256: cca935599a22478af0215beeb0b1f54d5e5c488b890ee6afa3fcf42b1f416f7d

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