Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c85b6cd3951d213…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 18:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f01e796439a03d0a9b659cabacd2c5df SHA-1: 79b16768a96280fe63bd782ed90fe38ca7b26d94 SHA-256: 2c85b6cd3951d2135b5deca687ea67955b9218f1d58eccfe393d7cce0b19467c
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as 'https://crophysi.ru/strik?utm_term=alice+walker+everyday+use+analysis', likely serve as lures to phishing or malware download sites. The presence of numerous external PDF links suggests an attempt to create a link farm for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=alice+walker+everyday+use+analysis In PDF document text
    • https://cdn.sqhk.co/tijinujul/j0Cwjje/53825572209.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/fPihiu3/wisafi.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/tjgjdXY/85841098135.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/1360424.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/irCgiiX/dufofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_601145cfc382a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fe1b5f682132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458635/normal_600575da76a6f.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/036c870e79.pdfIn PDF document text
    • https://jamofidomub.weebly.com/uploads/1/3/1/3/131398059/757e18ac44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_601bb491dd06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_600fa30a74381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5ffa10094dee7.pdfIn PDF document text
    • https://dopozagipixa.weebly.com/uploads/1/3/2/7/132741545/wozidiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_604d04d7f1c95.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/kovozenamofox/sean_paul_no_lie_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/33657449149.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/93883295436.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/maxux.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/nifunet.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/android_arsenal_recyclerview.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/zubokukukugebawegap.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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 5240 bytes
SHA-256: 83a92765f77d9b0a3198541f2b4d7f5e380bdbda7dd7fcf22cd815189b089422
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 10496 bytes
SHA-256: a781cc18b4ce2eed4464d9b1d853cec6274a0235ffe01501589bf95e02d2ee8f

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