Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e2f4dbe444d4fb…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 02:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3de34deff66a76099ab6740c9c487e1b SHA-1: 19dc801179e77171d52b04a504e591ff980ee23f SHA-256: a6e2f4dbe444d4fb82d6c727ac3d4593f55e5e97216cac797678c61bcf67dd52
186 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 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=wet+and+dry+bulb+hygrometer+chart+pdf PDF link annotation
    • https://cdn.sqhk.co/wajerewuwer/y9Jjejf/86303881527.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/hhcTyvX/3d_brick_breaker_revolution_download.pdfIn PDF document text
    • http://reabook.online/21390529812ndit9.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/hdgihj9/80057334487.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/30573714644.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/eihRidA/sojumaxemiwado.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/fokekaxuxibosimulod.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/fiaQgfM/gotiripegalusodewewezusun.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hcgfcpU/lugefilobokugatuju.pdfIn PDF document text
    • https://cdn.sqhk.co/doburazax/Pifichg/free_call_app_apkpure.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/dd_lego_dice_tower.pdfIn PDF document text
    • http://verifiedbadges-form.com/how_to_calculate_tube_bendinguwa3x.pdfIn PDF document text
    • https://cdn.sqhk.co/jifexekezeli/XDus23C/lego_legacy_heroes_unboxed_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_ece72c430c0a4b25ad519a30594a2969.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_541f4d06d54841b4b047728026e0a1e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba31568d-a0c2-45ca-b32f-7e6661b75649/poulan_pro_pp4218a_replacement_parts.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_274db30b27c34fec8591c8c7cf68b2bd.pdf?index=trueIn PDF document text
    • http://rulamiji.onlinewebshop.net/which_baby_bassinet_is_the_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da09c3f2-cf9b-4358-a949-5277fdfbbcd5/xuzobemuligam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807c2560-2339-48ff-b968-35156e588913/23324978081.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_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 5648 bytes
SHA-256: 353daff7fd03911ce93baf003edaa38f60a3ca2b04339ed9084205b90ca74bde
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 12048 bytes
SHA-256: 02469f7831cfa1da2fefceda56e5da82cb937f9f8162ac7b4239c5328590d209

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