Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4fd152847a89b7…

MALICIOUS

PDF

93.8 KB Created: 2021-03-28 11:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815f59e09db5d244ffa0aeab2b299cf0 SHA-1: 9bcd3c49e32742444352046001ea08d7c42b6330 SHA-256: 7b4fd152847a89b7f1d6e1b4bc36d5af4d498cbd910c8762fa959fe2396a0482
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated to appear as search results, a common tactic for SEO link farms. One of the primary external links, 'https://jumiwimov.ru/wix?keyword=skyrim+amren%2527s+family+sword+id', is suspicious and likely leads to a malicious site. The PDF also contains embedded JavaScript, which could be used to further facilitate malicious activity or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=skyrim+amren%2527s+family+sword+id
    • https://cdn-cms.f-static.net/uploads/4413238/normal_6046546f4b440.pdf
    • https://cdn.sqhk.co/vimewiki/GfNgdgh/english_ringtone_mp3_free_download.pdf
    • https://tigoxugijiwubaz.weebly.com/uploads/1/3/4/3/134315710/6887410.pdf
    • https://bisatabezuniv.weebly.com/uploads/1/3/1/3/131398333/a7529a80a9175.pdf
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/7380427.pdf
    • https://cdn.sqhk.co/nexetifosam/hdDzPVt/significado_de_la_palabra_repudio_en_espanol.pdf
    • https://cdn.sqhk.co/tivanosox/dkicCAW/how_to_spend_apple_cash_card.pdf
    • https://cdn-cms.f-static.net/uploads/4484114/normal_601b72bff3893.pdf
    • https://cdn.sqhk.co/fowipovoji/bjbigtT/pressure_washer_attachments_for_hose.pdf
    • https://cdn-cms.f-static.net/uploads/4405950/normal_60407b58f1e67.pdf
    • https://cdn-cms.f-static.net/uploads/4455642/normal_600a119fe7bac.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_6034470dcf0cd.pdf
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/859a8.pdf
    • https://cdn-cms.f-static.net/uploads/4458145/normal_60277e3b41514.pdf
    • https://cdn.sqhk.co/goluxewimabu/xyhfKgc/sniper_3d_mission_39_jandsburg.pdf
    • https://static.s123-cdn-static.com/uploads/4378410/normal_5fe223b2a5984.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_600fba527066d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9b0b5712-df34-4430-aa47-e4e55b06cf17/movokoveronoruzumuposox.pdf
    • https://uploads.strikinglycdn.com/files/46a63c54-1075-4387-9b84-fc60c35b60c1/how_to_crossplay_r6.pdf
    • https://s3.amazonaws.com/guxosa/24975860802.pdf
    • https://s3.amazonaws.com/bejokazemur/acute_kidney_injury_guidelines_2018.pdf
    • https://uploads.strikinglycdn.com/files/d8caa4aa-8826-4a11-82da-462b96d1fd6f/zojutojozakamimatatejedo.pdf
    • https://s3.amazonaws.com/gurafoga/voltage_converter_vs_step_down_transformer.pdf
    • https://uploads.strikinglycdn.com/files/9326badb-f49e-47fb-83e1-502eb2c5ee8f/46364997328.pdf
    • https://uploads.strikinglycdn.com/files/b4d9511e-50ef-482c-ab83-574d4ec9902b/88937116818.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011abd.bin
2cd78907a924bb1f1ae4fe9f99eaeda7e07e1a159acc916e3200fdf251039d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 5156 bytes
font_01_sfnt_off00012c3a.bin
cf240e90c37069225acac90504edfc3f8cc90c33bbb3ac9347e95b4df3e8f52c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 14832 bytes
font_02_sfnt_off00015b9f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9F 4324 bytes