Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a31e8a08b5485f…

MALICIOUS

PDF

85.2 KB Created: 2021-02-12 16:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 324320d94fe9b9f8159ae26dd3f2762f SHA-1: 55528031d02c0276759a4b8db30de7ccfccc67d1 SHA-256: b6a31e8a08b5485f5b8a8480f0ae850e2da0d1fbc42943e4438cf870c4ed3c83
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic or distribute malware. The presence of a URL related to downloading GTA SA APK data further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious intent, likely related to distributing or redirecting to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=download+gta+sa+apk+data+revdl
    • http://gordei2d.com/where_to_buy_foam_paper_sheets5mj3y.pdf
    • https://cdn.sqhk.co/vadetegubufo/QVB0idQ/skin_editor_tool_for_minecraft_download.pdf
    • https://zomutelisofo.weebly.com/uploads/1/3/4/7/134712892/41c52.pdf
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fdeb29e58809.pdf
    • https://cdn.sqhk.co/jeporikate/gggf6Ls/sokiwotu.pdf
    • http://mnclassis.org/nomenclatura_inorganica_ejercicios_resueltosd9ph4.pdf
    • https://cdn.sqhk.co/retesixabe/jdDjhrV/notepad_macro_save_file.pdf
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/kidujow-zawanevebadumi.pdf
    • https://cdn.sqhk.co/bilejufikone/bjHhdji/25768191907.pdf
    • http://domavera.ru/91394370082o2tzj.pdf
    • https://cdn.sqhk.co/gotakavapu/ckHifkm/pokizabibujutevalu.pdf
    • https://cdn-cms.f-static.net/uploads/4374545/normal_60112840333d4.pdf
    • https://cdn-cms.f-static.net/uploads/4481988/normal_600b573bc5469.pdf
    • http://asia.kiwi/thymol_blue_safety_data_sheettcwp5.pdf
    • https://cdn-cms.f-static.net/uploads/4496586/normal_5fd13340df2bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bajapovogam/music_crazy_in_love_sofia_karlberg.pdf
    • https://s3.amazonaws.com/zubata/album_chungha_gotta_go.pdf
    • https://s3.amazonaws.com/mokixetat/lefipirejo.pdf
    • https://s3.amazonaws.com/nodetuxapabara/zepimerak.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/que_es_el_pensamiento_psicologia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcd.bin
6be9cf63c8a852dbf0caec83cbe5baa179ed434e00f850c45d182efd23fad87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 5080 bytes
font_01_sfnt_off0000ff3f.bin
12b6f80863129f108d12af7365a6a4be43c4023ca9e8f577fa56e2000df0f80d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10296 bytes
font_02_sfnt_off000122cd.bin
20f912b6932addfa27ab6a24080b7b74380abf367cf774223465ee8118a36e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16660 bytes
font_03_sfnt_off000138fe.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 4324 bytes

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