Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16cf9ddab8b77f3…

MALICIOUS

PDF

100.5 KB Created: 2021-04-04 18:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2c704833b01e083fa5f3e1ce6e192bc4 SHA-1: ea867c3352860e8eed167c3adce4bea8ee969ef0 SHA-256: f16cf9ddab8b77f317e2ab8336d163032897938db38b0a9980ab540d0455ad52
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://zajinet.ru/strik?utm_term=navy+3m+pqs+study+guide PDF link annotation
    • https://cdn.sqhk.co/pevedapev/2geZ6ji/bird_box_meme_gif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6013416a0ea46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_60183808baffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_60601568d439e.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/iij2mjb/weguvidipebuwezibifosaxel.pdfIn PDF document text
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/1670d3d17.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/Aibjihj/wallpaper_android_cute_dog.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/nojizi.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/fQa6Bgc/assistive_touch_bubble_easy_touch_for_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/gh3jbNO/37384417068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/046a4bff-cd9f-46e1-af6f-d4795c65c5d7/mecanica_vectorial_para_ingenieros_estatica_9_edicion_solucionario_cap_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/autograph_movie_full_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/fapadagolinivunalipunuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8205d9-f7e2-4f5c-850b-e79c26900c9c/44191370184.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/raxirozumasulovisowegixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6898ce17-dcd0-4deb-abde-28b73a2b4a14/47667565890.pdfIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_a2e6f0f94ae04812814cf571455fa71d.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_2484aa37669a4cb3812035b65e4a9a7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/bosakinetewibuxopiwerebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab733953-5ac0-42bb-99bd-48fe48cbf9d6/how_to_turn_iphone_off_silent_mode_without_switch_ios_13.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/wetufimetifuv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000148cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CB 5572 bytes
SHA-256: c0e59451511eda2bc5b729005f472abb743efa24c35cf6204599724ec588a5cc
font_01_sfnt_off00015bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC8 12292 bytes
SHA-256: 05311506f72b092cf669eafc06dce3236a06543383fab1608c2e85df165fa41d

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