Malicious PDF — malware analysis report

Static analysis result for SHA-256 1051cf7597ab6a4d…

MALICIOUS

PDF

66.3 KB Created: 2020-12-04 11:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f481ef4d73cf186d2abed55d433f335a SHA-1: 1991e3df499b39fcb2ab9a5a3692513b3d8001bc SHA-256: 1051cf7597ab6a4dbad5ffde9bc844e68b5fe0322586693a4593b7e417e04036
184 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, with critical heuristics identifying it as a malicious redirector and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of suspicious links suggests a phishing or spam campaign aiming to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=memory+unit+crossword+puzzle In PDF document text
    • https://ligibodi.weebly.com/uploads/1/3/4/4/134469997/3488d34ed8.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/8991076.pdfIn PDF document text
    • https://nobaditidiz.weebly.com/uploads/1/3/4/2/134235496/gisifegopukedis_bikukik.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/safip-tefotulivozo-tetevokol.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/d2d830a3b407.pdfIn PDF document text
    • https://nepopuzabigeju.weebly.com/uploads/1/3/4/8/134856357/parudoros.pdfIn PDF document text
    • https://gunomelovolif.weebly.com/uploads/1/3/4/7/134735852/jebitoj.pdfIn PDF document text
    • https://lekipavovat.weebly.com/uploads/1/3/4/3/134332936/kamewa_wopomunu_peloruliduraba.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://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf627ce6d49a06bb89bcad/1606378109039/zuladewewavomu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf64597acac6192ab8ec5c/1606378586210/57865427209.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57dbce5c7695ca9ba8aee/t/5fc6005b64571256540a7003/1606811739823/fortnite_download_unblocked_chromebook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc588525bcb0228a2a1f2c3/t/5fc6f54709f4d56e8f784a83/1606874444412/55456395987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c3a9d3-4cf5-405c-ae7f-91a391cd624c/one_and_three_chairs_conceptual_art.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_off0000bb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB20 5140 bytes
SHA-256: 9fd8bd558f81737a4473044dc460ea2da6e4de7df50515aef0d8d52719040ece
font_01_sfnt_off0000cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 9944 bytes
SHA-256: 7d470da6e478ab8b231e0c8b9a67ff3bc9470165197230034f00a041225d71b7
font_02_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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