Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c4712b1d7e4f99…

MALICIOUS

PDF

72.4 KB Created: 2021-03-18 20:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bcb51c3c08f7c1f83ebbcdbf7e1631f3 SHA-1: 6807834bd5af6a36c648c14d464ec528a08fc67d SHA-256: 61c4712b1d7e4f997346f8f4d992c4e66d7fd844aac345288a0f30b4d5de61c2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the presence of numerous URLs, including those on disposable hosting, suggests a potential for redirecting users to malicious sites or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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=ca+final+costing+paduka+pdf PDF link annotation
    • https://pokiwaminexaga.weebly.com/uploads/1/3/1/6/131637240/7037375.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/jolufeliloz_boxowari_rixopumukag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_603fc64a154a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_602e83a577782.pdfIn PDF document text
    • https://rebifigu.weebly.com/uploads/1/3/4/6/134663288/5956632.pdfIn PDF document text
    • https://pilogowizimofog.weebly.com/uploads/1/3/4/6/134604263/juvujanegusakamag.pdfIn PDF document text
    • https://kovepezerolozu.weebly.com/uploads/1/3/1/4/131483153/migamoraz_dufafileza_kalig_logakiwigukadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455672/normal_5ff2edcacb5a6.pdfIn PDF document text
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/ae3bc8.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/borehole_water_quality.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6017ced195c36.pdfIn PDF document text
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/fuxokoxuwogukiputu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fe0312c3cb93.pdfIn PDF document text
    • https://letanidopubiza.weebly.com/uploads/1/3/0/7/130775959/f79def3c8e76bc.pdfIn PDF document text
    • https://dofusugizubev.weebly.com/uploads/1/3/4/1/134108946/vijitawukubakadumok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_6012966f2ca83.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/af6345683c405b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/mechanical_engineering_drawing_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/nusevuwojezaxeduborumu.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/fevozosuda.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/bigife.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/battery_saver_for_iphone_4s_free.pdfIn PDF document text
    • http://gezixus.myartsonline.com/63992318320.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/1996_ford_ranger_transmission_mount.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5196 bytes
SHA-256: a144a09ef50d2e923bc5ee42b9f9d6c251c99230fd06def3d6b7f0357d672484
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 11224 bytes
SHA-256: ce3830ec0aad036d637dfa13e8ee4c1d2ab1bc1ab51cb74f9346a9442bf5c4f1