Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a63034617638d5…

MALICIOUS

PDF

77.2 KB Created: 2021-05-29 07:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d1c0e722a288345c35be77e440c4797a SHA-1: 68199ae114b478a69566f07e30a355412853e72c SHA-256: f3a63034617638d58710a8af8933de64183fc5f792bd542c2741e28ac2853438
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 0.9997

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://xajibur.ru/123?utm_term=editable+baby+shower+invitation+card+template PDF link annotation
    • https://lunisaga.weebly.com/uploads/1/3/5/3/135302545/d0af3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5fecf3c0d0030.pdfIn PDF document text
    • https://gilukuxuzi.weebly.com/uploads/1/3/4/4/134494221/4d868753.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/1856001.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409619/normal_60b06f83a1a41.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/zigorow_lodasavijub_mobafobusa_jojole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fd79a54c2885.pdfIn PDF document text
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/2941013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_60168c1aa6add.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/sawofofato.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/170af738.pdfIn PDF document text
    • https://zagumukukawikam.weebly.com/uploads/1/3/4/6/134608037/226217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3d287b29-4af4-4566-ace8-b4841ede8562/is_muay_thai_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58e5a49-a90b-4da1-9a15-e204e15a7e3f/22715694223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ce7aac-6c17-4dd8-ae5a-4500acca0b2e/93819752040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb34c9e-0a76-44dc-a809-6857447f9cdf/is_there_a_book_after_city_of_heavenly_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95969cb6-24e7-4fb3-8f89-765b96641ad5/ocarina_of_time_randomizer_multiplayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad41f26-b221-4b30-a90b-edff41a331a1/rakalujemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85ab974-3962-4fbe-bad6-54cd006535db/92443112157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858a6d90-42ad-4b98-87b5-2b701165ba64/11389485285.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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 5452 bytes
SHA-256: 6579462121df34d031673cc21579fbdc78c40b1b739790de3937b610df97c079
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 10216 bytes
SHA-256: bd75d66829f763d1d40821ad2bab7f4094bf2a0ece76141ce824e09365b6d7a0
font_02_sfnt_off0001191d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3