Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1153da9a61aeacf…

MALICIOUS

PDF

89.6 KB Created: 2021-03-18 17:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3073db6eef15f572e3b254109080e158 SHA-1: a4aed1049811450ed91d2d5ab01e4d5291fd9ddb SHA-256: f1153da9a61aeacfc22c3d6244a2f22747f3e3a66d8c083bfc857a6aeb3fffb9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious sites.

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://ponafet.ru/strik?utm_term=john+deere+l110+automatic+drive+belt+diagram PDF link annotation
    • https://fupojipivub.weebly.com/uploads/1/3/4/5/134525069/9672159.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/tonitenuwe_milexid_jatalali.pdfIn PDF document text
    • https://fumitofid.weebly.com/uploads/1/3/1/6/131637255/dixolifewulakidopam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_60026564db2b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381320/normal_5fef6bc2c5620.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/fatebagilufawisapim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5fffaced836a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372080/normal_60078c7205bee.pdfIn PDF document text
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/5502172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369643/normal_5fffd9d4941aa.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/c67d3eb1-26a0-46a4-8986-3888b0d77214/what_happens_in_the_rapture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fba46f-8e48-42d0-a784-a22312702ad2/sujadosamoxefux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3b0eea-0ea5-4bde-9baf-55d9c4cb72fd/fokire.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_a061385a6a4a43cb8503c726cf0a46ba.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_4d4fdd434993457ab792a29da65ffaf5.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_459360cd36d349ccaab8acf79b67eba1.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_cd329fcb5d234586b6372bcd27ac53ee.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_2f0612cec5924dd687499bb907cdc019.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9136510d-63cd-4ce3-91ca-2eda7f38d7a3/sonopadupifenagefaliwewu.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_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 5440 bytes
SHA-256: ec708229cbf20fb6c5975558d676e6f039d4f755bd8868f285390a3d4d3a72f0
font_01_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 12208 bytes
SHA-256: a5bf82cbaea36ca937f1fa3de1007c6d3b78c25d333a95604af8e3cb954af7f9
font_02_sfnt_off00014a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34