Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c000649506df0e6…

MALICIOUS

PDF

79.8 KB Created: 2021-05-08 23:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 375291fa4fcd66c6c360cde47301f815 SHA-1: 5f6e4e629f920a74e199752cf8cbb0b66f04a931 SHA-256: 7c000649506df0e61d69604070a68cb385859dd2df9a54a60eeef39456eaf4e7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=arduino+uno+r3+grbl+pinout PDF link annotation
    • http://ganitigusawev.mygamesonline.org/barash_clinical_anesthesia_8th_edition_download.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/ba7d4.pdfIn PDF document text
    • http://dasuwupozu.22web.org/delonghi_space_heater_1500w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401716/normal_5fed9217db258.pdfIn PDF document text
    • http://setovewurepenu.22web.org/88772831042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466411/normal_5fcddca746caf.pdfIn PDF document text
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/926dfd2988e59a.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/what_color_is_jared_padalecki_hair.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/chajja_design.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/campbell_ap_biology_9th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_b1606fa67a194fc6a26673237e0c9d80.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_fc447f153d794e61b41124ea3292abd8.pdf?index=trueIn PDF document text
    • http://lajefuvubesij.epizy.com/69122077691.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_d0a37623a62f452bbc05ec575444dcf6.pdf?index=trueIn PDF document text
    • http://judoxezoxo.rf.gd/causes_of_breast_cancer_in_urdu.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/white_tiger_hindi_movie_cast.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_d21c3e554418469ba371035fa7e2c89d.pdf?index=trueIn PDF document text
    • http://jixopararaz.rf.gd/angioedema_hereditario.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_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 5032 bytes
SHA-256: b1176fb593632ca27c5162c75b5674b0fbd26a6d6d8b18b79ce05bb708a6dcd4
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 10916 bytes
SHA-256: 027a3cc805d5ca7cecd9d6ac80d5b525e72be0bb2d2b43a033384b9f0124d15a

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