Malicious PDF — malware analysis report

Static analysis result for SHA-256 7016b0dbc8f8e4dd…

MALICIOUS

PDF

144.3 KB Created: 2021-03-29 16:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1b5a050fe5c2f576d66f5ef0336f5f6a SHA-1: d8ac7f5b781abbd9b0792d899a23c1f068bf962f SHA-256: 7016b0dbc8f8e4dd3623475c128acb633d62c257f6c4c64e4b8000e3ab1e2371
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 point to suspicious domains, indicating a link farm designed to distribute malware or facilitate phishing. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. ClamAV detection and ML classification further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=systems+of+linear+inequalities+word+problems+sat PDF link annotation
    • http://shtangye.xyz/10124288891yaqhj.pdfIn PDF document text
    • http://merovew.xyz/bunuvonapujadanokemota6gnsj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_603aac904826e.pdfIn PDF document text
    • http://japancar-sib.ru/47475896485637qi.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/20181651240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_5fc71c5851888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_6017a45016c1e.pdfIn PDF document text
    • http://komarovskii.xyz/76404314488osfxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/game_of_thrones_episode_1_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/mailchimp_subscribe_form_html.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/gatolabijusekamarafidara.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/84863430434.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_732a50fb79124cc48eb4e3b7fea9e2a3.pdf?index=trueIn PDF document text
    • http://samajusinifako.atwebpages.com/xupelupokixafoje.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/format_ccitt_u-_law.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/small_engine_repair_movie_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/is_twilight_midnight_sun_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/sodene.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/99068722490.pdfIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_760c3cec053e480e939904881003b031.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_dc5c5224279642f88e1411bd997d1d14.pdf?index=trueIn 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_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 88912 bytes
SHA-256: cb0ae8d6204957df45c7abde89ad0e67cbe0b346c1b5f482aef5b63530703c09
font_01_sfnt_off0001f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F70D 5752 bytes
SHA-256: 7606ba21c938b6c083358b35a1e86a5f0c439a36e1359353afacf1eaf6e116b1
font_02_sfnt_off00020a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A97 11120 bytes
SHA-256: ce1d8d806b7a0cae20cfaae87478881ae904787901f80059edea4b3b55e2f656

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