Malicious PDF — malware analysis report

Static analysis result for SHA-256 152d51f3966ea4a6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 06:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7eab2d18b17975cb5d4a64158e3b8af6 SHA-1: bdc1c6748f0c35d166de7615b8fe350c5df678b7 SHA-256: 152d51f3966ea4a66e0497ea70733cd9c3e260a166686a0f54a972b53ba75382
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 0.9998

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://jacksth.ru/123?utm_term=fios+tv+guide+right+now PDF link annotation
    • https://cdn.sqhk.co/gerezowuves/jhcbiam/72341823137.pdfIn PDF document text
    • http://kanshoper.site/macbeth_act_2_multiple_choice_quiz_answersclmvo.pdfIn PDF document text
    • http://ita-talia.fun/fallout_4_ragdoll_physics_modkyjyn.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/aniajj1/assistant_director_jobs_film.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/fgdN1hU/94056852069.pdfIn PDF document text
    • http://levantegroup.net/67308972096ztiny.pdfIn PDF document text
    • https://cdn.sqhk.co/nobuwinulad/hzGhffZ/botim_apk_without_ads.pdfIn PDF document text
    • http://wei-nmvc.com/cisco_ise_2._4_license_ordering_guidefzah8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_12eef5fb4d8d49279dc73d42c4cff39c.pdf?index=trueIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_2981bfe6e828437989aff08a2d76d1fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b090f147-8381-4831-a2ff-eadc1d6645aa/shark_navigator_upright_vacuum_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/casabianca_poem_question_and_answers.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_7a2d42500d47444b8a96902616da9941.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_39e57e2493f84222b6584973c8ab480e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72816fda-70cc-4d79-8f33-e1c0b60f5a4a/download_jerome_bible_commentary.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/anjali_anjali_tamil_song_free.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_ccc20725a4724f5ab839b2fe878396e1.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_d78472a5437c4f7e964f6fb41643950e.pdf?index=trueIn PDF document text
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_5a0b48169c874a229aa904e097a2243a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9483f6-63e3-4b50-bf41-0be1db6d3333/sat_physics_subject_test_download.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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 4952 bytes
SHA-256: 643407eab3bd0dadd036ae7f44d983316c9686425beec246245f24124b70423c
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10888 bytes
SHA-256: 13d98059bb8b17b38eb64e9e2ddc196df25017ebf0c736bae51450bc81604a60