Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d776d60e77417…

MALICIOUS

PDF

79.1 KB Created: 2021-02-14 21:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fa9e9c387662dafdba2f60d70d72a16e SHA-1: 9b1bc0bef843433339ecc7c314382d3f5e7d646c SHA-256: 924d776d60e774178466cc2ee479abe152777a3146510fedb17b7cde7142d2e7
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 0.9997

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://baarspo.ru/wix?keyword=how+to+install+apk+on+phone+from+pc PDF link annotation
    • http://app-3null.com/ielts_10_test_1_writing_task_1_model_answeralrgc.pdfIn PDF document text
    • http://smotrikino.fun/45022180964ra1zv.pdfIn PDF document text
    • http://springtea.space/89469925646was3m.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/9eba4a8.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/2958277.pdfIn PDF document text
    • http://wobepatonogez.iblogger.org/marriage_d_amour_sheet_music_free.pdfIn PDF document text
    • https://wuwenesugujiku.weebly.com/uploads/1/3/0/7/130739695/681992479612.pdfIn PDF document text
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/vexubav.pdfIn PDF document text
    • http://puwuditufu.22web.org/tiluret.pdfIn PDF document text
    • http://reduslimitaly.website/lagu_waiting_for_you_unlike_pluto6c6u5.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/luvizododekib_vamabu_gumomowabefotef_nipewagupo.pdfIn PDF document text
    • http://kozizukexepuf.22web.org/vejafigeludari.pdfIn PDF document text
    • https://rurajutudap.weebly.com/uploads/1/3/1/4/131437622/f1e7ce461aa.pdfIn PDF document text
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/1776145.pdfIn PDF document text
    • http://glossywp.online/jotir90iun.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/jamid.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/7596698.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/2576363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kolosavozogu.rf.gd/status_app_video_free.pdfIn PDF document text
    • http://nixewawomito.epizy.com/adobe_premiere_elements_9_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 5160 bytes
SHA-256: 8802a8141f918ab1db3e4545487a63026c899c983f5fd9a9da70591e8286cdfa
font_01_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 11172 bytes
SHA-256: 81fe87d04cd0a42348918e24c1daeb449b3ef11ea886e1e69a4e47219d4a3d67
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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