Malicious PDF — malware analysis report

Static analysis result for SHA-256 d127834f36f363f0…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 11:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3036454f92a609fa43013d57c68fbefa SHA-1: 5465b88712688fd85f36196927ee1d92f91c41e9 SHA-256: d127834f36f363f0e98929e474238b064d5b4b3e70479947825ff6735381f5c9
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, with one pointing to 'https://druttle.ru/wix?keyword=psa+didn%2527t+deliver+my+birth+certificate+online'. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=psa+didn%2527t+deliver+my+birth+certificate+online PDF link annotation
    • https://wuxavuzipirugud.weebly.com/uploads/1/3/4/0/134012349/7793637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_603532079401d.pdfIn PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/lexozitilewixav.pdfIn PDF document text
    • http://bakaxufukove.iblogger.org/arbitrary_waveform_generator_arduino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_5fd8b22048020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_6039c7e43b101.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/9237478.pdfIn PDF document text
    • http://rimka.xyz/how_to_count_words_onlinemzvnw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_604b942a3ce64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_605000c087cc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5fcf0a446764c.pdfIn PDF document text
    • http://natnat.fun/zobizgra7f.pdfIn PDF document text
    • https://cdn.sqhk.co/venujotiwufo/gdUtQjj/nugaxabuduvilamumetasujik.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/jiifhhI/49899761339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602f0f4559022.pdfIn PDF document text
    • http://gobigs.space/class_10th_maths_book_kpkheefh.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/3hcie0g/nail_foot_doctor_knee_replacement_surgery.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevikokuzufos.epizy.com/32059942550.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 5596 bytes
SHA-256: 15114c6263397e0052f191ef89a81e3c81b6cc258fc5722cf60c29c8fd6a2860
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10704 bytes
SHA-256: 989ca71649fb0c46fc2f7f66d5e901325921f2d0e4cf633d2f110e4bfa5dc2da

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