Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a417d3779756f2…

MALICIOUS

PDF

70.7 KB Created: 2021-03-21 22:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c7b7446f9d596e609cb00d439b41730e SHA-1: d824076db3dce58790d909fbbf030516bbabdb96 SHA-256: 58a417d3779756f242b72bd5239dfab69944d468758f5b0d06737603e1de8b1b
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, with several pointing to potentially untrusted domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=pemeriksaan+sediaan+apus+darah+tepi+pdf PDF link annotation
    • http://onlajn-kassa.ru/mukewizuymp5q.pdfIn PDF document text
    • http://kind-insta.site/download_yasin_tahlilct5d5.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/egVXrQs/art_of_war_movie_wesley_snipes.pdfIn PDF document text
    • http://brumbum6.xyz/42795235238p57g8.pdfIn PDF document text
    • http://idealslim-ordina.site/321960478311qkx4.pdfIn PDF document text
    • http://latencfsrt.space/41753084631y23sy.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/qn6Xfjg/food_wars_shokugeki_no_soma.pdfIn PDF document text
    • https://cdn.sqhk.co/detateseb/ehgbs2t/32411752918.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/eiaiehe/farm_story_2_hack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/0haih4Q/two_player_games_for_playstation_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_e09f1a280a344f6e8503ce1a2db38413.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/rebofasube.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_d7e48067fbe146cdb2746d32ad5bb689.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/dokumen_akreditasi_puskesmas_bab_9.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_69f2bb33a0f84ef1806b0a25a8f8a863.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/43725799906.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_73cc95160ea142d9aa4b6ef41e220d6f.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_27ad110af985482899769a12351a9ee0.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_dc463a5353cb4a2aa2cca96e0ac30a17.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_9d82ce3f731640c9b0b67dc2d587b888.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/fetesajopirelatewozeko.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_72ead964411f4533b6e72b79e23f6675.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_ebc14cbd34664a31ae13171fe4caafb1.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_e9c023cc06a9430fbf691429a57f9897.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/badger_5_garbage_disposal_leaking.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_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 5312 bytes
SHA-256: b605654186ed81d4ee277af4e41e145099facdc1c56f061dae40eef65e98ed71
font_01_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 10416 bytes
SHA-256: 4a01d792bc47489e7e3b4121d53bf77ce16c9ab91ca85ee0c69022b64f4cd414

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