Malicious PDF — malware analysis report

Static analysis result for SHA-256 13194d26a4299177…

MALICIOUS

PDF

119.4 KB Created: 2021-05-28 21:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 169974833057ccf338e488f45ab1dde3 SHA-1: 511ec92d452f4f28157719c03a67163b45d28a35 SHA-256: 13194d26a429917769340e2ba67d46eb6dde3eafc9c647dadcd911081b7cb8af
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=lean+six+sigma+and+minitab+pdf PDF link annotation
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/3183079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fde3e8ae1bf9.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/4846472.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/tazepegenusapoz.pdfIn PDF document text
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/9797207.pdfIn PDF document text
    • https://gedobelega.weebly.com/uploads/1/3/4/3/134375191/danev.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/xenidivasowod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_60124c9529528.pdfIn PDF document text
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/digixod.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/pabowugidimubi-fizifelojelodik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_6055026ed7957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_600fbb2744230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fe558266ee20.pdfIn PDF document text
    • https://nitagupivef.weebly.com/uploads/1/3/4/3/134342099/6612679.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/5cde9c0e-ceaf-400c-9252-ab6a7509eed7/19140672280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b3ac39-c45f-40a1-9980-ff8745ebe28f/how_fast_can_a_maserati_granturismo_go.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d756e893-12d0-4c0a-96fb-f7a2048515b7/35709063205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ebafd7-1c2e-483d-aa60-f5714dfb4013/90834452663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861947c3-45e0-458f-966a-423ac3f33006/is_a_shoe_business_profitable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217823f3-bb4e-436a-a634-c9b1d2acb427/juziguvolivama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434d656e-5848-4766-b43b-2b71e4e432b6/harmony_touch_vs_ultimate_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801001ff-efac-406d-a90c-9d92646d4c7d/what_does_cl_mean_on_my_lg_inverter_direct_drive_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a381f07a-121c-46ff-be70-c1163942015f/85920090145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1385b8f0-b9d7-469a-b1bf-136799ed542b/the_lady_with_the_toy_dog_chekhov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e9f0e6-4817-42e5-bead-268d518a3f51/572469016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000185f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185F2 5380 bytes
SHA-256: 6f7b12c74137fb4ab26c6f684c202982de0f546a2672fc59d5c69458a91fad46
font_01_sfnt_off0001982f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1982F 2924 bytes
SHA-256: 1254e434ed1f84e6f2af1525439491f7fae2156807eddeed9ab5be00d3807af2
font_02_sfnt_off0001a4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AA 12636 bytes
SHA-256: 64c669db851a4d0b2372e702c0ea3e06e089ca0c5ee72ecf891aa0e9ea9637e0