Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b91fd2c38724de7…

MALICIOUS

PDF

61.8 KB Created: 2020-11-13 05:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 16cb7912b1608308d619d56a16b84888 SHA-1: b9526033e8e10488ec65c1e3e5491378fac1a39c SHA-256: 4b91fd2c38724de7620f74dece171a53b1733e52c50b4b91b7d1aa55dc53674d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent URL, 'https://trafftec.ru/strik?utm_term=engineering+economic+analysis+13th+edition+solutions', is directly associated with the document's content, suggesting a phishing or scam attempt. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • 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.
  • 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://trafftec.ru/strik?utm_term=engineering+economic+analysis+13th+edition+solutions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492253/normal_5fac4dc2e616f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f9d4e0846847.pdfIn PDF document text
    • https://zazusixalug.weebly.com/uploads/1/3/4/4/134491239/detibixiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5fabefb2a53c3.pdfIn PDF document text
    • https://faluwizux.weebly.com/uploads/1/3/4/3/134372305/dupix.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://s3.amazonaws.com/zupenafud/las_mil_y_una_noches_cap_157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc89cce9-610c-491d-ba12-412ce1adc3ba/suriwononox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd76b0e-33b4-4e76-9486-c64c9116a055/vapiwiletokafulipir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3a59f5-49d8-47ce-aedf-2f231bf7b895/85195474316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35e86da-5d7c-4684-abf8-a299068819c8/wizumefagurulexikufomi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/15865747489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fcf72f-8aeb-443d-bda3-1cfd8fb528b2/pilubegoxilam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4fa50e-4daf-467d-ad66-8c06bb438ad2/mepetoparetik.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_off0000a927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA927 5508 bytes
SHA-256: 569474837401d1437fa091d847675fc2898e2435e603bf5a3e52b576e262e1b5
font_01_sfnt_off0000bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB0 9432 bytes
SHA-256: 808a611751c78d0d936d98c8d5ea8a26dbb991ee9121b7fee13da2e91f381f58
font_02_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.