Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8456c59ae88a03…

MALICIOUS

PDF

81.6 KB Created: 2021-06-01 09:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 05fb5ca175441277a8afc2364e7c3f47 SHA-1: 20f1b550ec68d5052525cb6a0864c72efd26f7a0 SHA-256: 3f8456c59ae88a03f6c3ca5d8a5c6ae31245e75c20b60e6ae3054b042e1125bd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting services like Weebly and PBworks, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked documents. The presence of external URIs and the link farm structure are indicative of techniques used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/pbw?utm_term=download+images+from+list+of+urls+python PDF link annotation
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/sadowepo.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/1770497.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/gikobaviwij.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/zovawelakofiweroxe.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/3123811.pdfIn PDF document text
    • https://nalirukixew.weebly.com/uploads/1/3/0/9/130969663/lobagajulexakagose.pdfIn PDF document text
    • https://zegamabifogur.weebly.com/uploads/1/3/4/6/134648685/a5d276c2.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/lenogigijuj.pdfIn PDF document text
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/zunazimikimo-jaraxuxofa-nixizavosonen-najunol.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/7983481.pdfIn PDF document text
    • https://nikadarax.weebly.com/uploads/1/3/4/5/134585483/vakaj_lagen_wekixuzigajot.pdfIn PDF document text
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/858f3d5f6909c.pdfIn PDF document text
    • https://jibudodenip.weebly.com/uploads/1/3/4/3/134364722/sofinawo.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/7811479.pdfIn PDF document text
    • https://tapukupe.weebly.com/uploads/1/3/4/7/134717462/pisajilutajiza-wasimusadomuduv-zukuluzinep.pdfIn PDF document text
    • https://fekatasu.weebly.com/uploads/1/3/4/5/134505636/9018254.pdfIn PDF document text
    • https://tonezesonor.weebly.com/uploads/1/3/2/6/132681734/siludefuseper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supijexed.pbworks.com/f/my_stupid_boss_1_indoxxi.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144427200/45416174607.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/144446400/bemovi.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/43408492770.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/how_many_pounds_of_feed_to_raise_a_pig.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_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 5648 bytes
SHA-256: aaf4f1631cb9caa2993fa7cec6b95793d1de76582e06519bdf2a4ee2eb5475e1
font_01_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 11600 bytes
SHA-256: c5431f2d2c9f139cf227731a7658a44962009f980abc6154a785a93b26fbc0a1