Malicious PDF — malware analysis report

Static analysis result for SHA-256 5052c48304c22956…

MALICIOUS

PDF

77.0 KB Created: 2021-04-27 05:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e72471c693b9084f9a54755d524ad92f SHA-1: f8f09816159251d363e6f5ceac246256e9d4a7ec SHA-256: 5052c48304c2295684730316a9709fc1051e9ec075fd7fbc5fdda1182ab5451f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=they+that+wait+upon+the+lord+lyrics PDF link annotation
    • https://binelotetite.weebly.com/uploads/1/3/4/0/134016953/120762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5ff3f1fbacd0c.pdfIn PDF document text
    • http://idealica-co.site/hornady_reloading_handbook_9th_editionbpurj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_60493f152f469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_605a93eb82c41.pdfIn PDF document text
    • http://mebelintera.ru/how_to_connect_polk_audio_speakers_to_receivergpynm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484990/normal_5fec892395bbb.pdfIn PDF document text
    • http://help-bluebadgecenter.com/fonefotukewofida509ew.pdfIn PDF document text
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/1447185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_6065431b38aa6.pdfIn PDF document text
    • https://jagobedumaniso.weebly.com/uploads/1/3/0/8/130873939/5950360.pdfIn PDF document text
    • http://creditinquiry.info/how_to_put_seat_on_fisher_price_jumperoo89urt.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/zikevibiboz_gedaxumitese_dorajapadisono_jurodig.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/rixokusafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_e2c8f139bef941069a6564d552e1e7fd.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_6adb8ccefece4402bd598be35b63a9ad.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_cf19ce444d304610a962531ceade8c27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11805729-cee9-4077-a3ad-9470e85bea15/46458149090.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_b25deea426bc40c1bd3073512326644b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9724a85-4b1d-49cc-9c1a-b822e1600bf5/how_to_smooth_textured_interior_walls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691faf04-264d-47e4-8fe3-35cbf52d60c5/nomelaxidinur.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_5207f6c49be14bd7a501d572f5285a4d.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_8eab70b5b2984e31ad4bae541f7accb4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 5304 bytes
SHA-256: 2352f7042d2564c4995c0d08fd98d061bad5c7fac4db175c5bf306d1855638f8
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 11672 bytes
SHA-256: dea827a14bf80912dd8633ee05170ac1a82fd8676073872df1c7cb4dccb3d3be