Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9315d904c742d6…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 04:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1faf51eb9261259c531eddb25418d0cb SHA-1: dfa19682c5ba7c4cbe4ff9fcde5e94b72b48b8ec SHA-256: ff9315d904c742d6c163c61995518a475b209894ee66f2c3579dd288806fe296
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of an SEO link farm and a redirector, designed to lead users to external content. The embedded URL and the document body text suggest a lure related to 'non root hack apk', pointing towards a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/wix?keyword=non+root+hack+apk PDF link annotation
    • http://pesuloduf.medianewsonline.com/wotusamubipos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fd28becc671e.pdfIn PDF document text
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/a6a9ac34b4b.pdfIn PDF document text
    • https://firudofomupavu.weebly.com/uploads/1/3/1/3/131384713/fufal_xefiropajir.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/6cb0ad10b00480.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/vozewotel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_603939b90ec77.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/12803788940.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/bf3ce97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_600aa6b3031a5.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/mapa_mundi_paises.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/rewepalazamiso/panasifazeredakibi.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/wahl_clipper_blade_replacement_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/chhattisgarh_district_map.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/pijotefis.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/maxiguzazukupowim.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/83526968650.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/78464690018.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/flute_sheet_music_havana.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/dobukosupowukodi.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/driving_test_nj_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/britney_spears_toxic_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/tutorial_autocad_electrical_2018_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/olympus_om-d_e-m5_mark_ii_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/mirorile.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/solid_slab_design.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_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 4844 bytes
SHA-256: 523889e9c96f00b80db465f6fa9364ff6fa56f31954346b50472dc0d50435285
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 10940 bytes
SHA-256: 7ac1e79cf7dd8df6f7bd0036aa20eb69213a1889eafcfc0c78b77ccc165d5430