Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cd83ee1c9c8df0…

MALICIOUS

PDF

74.2 KB Created: 2021-04-02 16:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ea3920952d166549430a23638e107f6e SHA-1: a83a3c509c9b64efa921c4ddc912f8fb388a9c90 SHA-256: 91cd83ee1c9c8df09bc6d7310ca53576194efab8d816a9b93a75ef8f2fc50cb8
246 Risk Score

Malware Insights

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

This PDF document is identified as a credential phishing lure, specifically impersonating Instagram to trick users into clicking malicious links. The document contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farm tactics used to distribute phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/5946849.pdf.
  • 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://zajinet.ru/strik?utm_term=how+do+i+renew+my+ham+license PDF link annotation
    • https://cdn.sqhk.co/nizekidido/MbIiioQ/rise_up_song_lyrics_thefatrat.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/jeayieG/alchemist_toolkit_shattered_pixel_dungeon.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/TRpUdws/40332999627.pdfIn PDF document text
    • http://zujuzerawijuk.medianewsonline.com/zuvinagonadimuvafodew.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/53720686100.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/yNgjiaa/toolbox_murders_blu_ray_review.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/5946849.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/datilemudode.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/iNGumhi/imetric_profile_follower_analytics_for_instagram.pdfIn PDF document text
    • https://jozurukezareta.weebly.com/uploads/1/3/4/7/134741488/9264507.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/hfhOgdl/juventus_jersey_2018_19_away.pdfIn PDF document text
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/3672604.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/gehcjip/kogama_unblocked_66.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/FCRhalD/61315418252.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/5730183805.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/YHljbTZ/26106805261.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/69035169506.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/jOhf0gh/67749741638.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/iRhdmfI/armaan_malik_songs_lyrics.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/kiminijovumenawobaxij.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/starting_my_pressure_washer.pdfIn PDF document text
    • https://mitosimizede.weebly.com/uploads/1/3/4/3/134372473/1944498.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/zC3jbv3/49462277699.pdfIn PDF document text
    • https://cdn.sqhk.co/javajadoj/idgfMZ6/free_download_farkle_dice_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/jeGMD2k/bubble_fruit_shooter_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimobepetokonud.myartsonline.com/free_download_entrepreneurship_development_books.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/53134288618.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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 5336 bytes
SHA-256: da3674f8141fa23bd344bd53f54e7b7a3f02bf5ae1f60e2098610a10d060ee54
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 10288 bytes
SHA-256: 25e8abd2069970cdee3beefde1d7cf1dc48879c758c9fc3b1900945284232c35