Malicious PDF — malware analysis report

Static analysis result for SHA-256 28255016e9829d3d…

MALICIOUS

PDF

85.7 KB Created: 2021-05-01 11:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a1958600cc4a887e6465236fbedeb752 SHA-1: 1a3867e5462241791751a198e749d826679f0bb0 SHA-256: 28255016e9829d3d86795c2442a4b9a992e5c4ff8c05a337f000581842d05755
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/strik?utm_term=what+is+distributive+justice+in+nursing PDF link annotation
    • https://gifitutopa.weebly.com/uploads/1/3/4/4/134470147/kenid-kaboma-kawomukobiwa.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/molepobubutatof.pdfIn PDF document text
    • https://zezodejesamibiz.weebly.com/uploads/1/3/1/1/131164097/nijas.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/ygdPWja/true_surf_cheats_ios.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/9a57f9c.pdfIn PDF document text
    • http://buxeletifexid.medianewsonline.com/85326379733.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/dusuzimuruvo.pdfIn PDF document text
    • https://cdn.sqhk.co/dilipokoje/gfjhNia/gangs_of_new_york_espanol.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/80872230005.pdfIn PDF document text
    • https://kujarubokaja.weebly.com/uploads/1/3/4/5/134590089/3f012.pdfIn PDF document text
    • https://gavuzidawosowek.weebly.com/uploads/1/3/1/4/131413418/ralalajinamozizajeb.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/7760828.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/pxhg7hB/hide_the_pain_harold_thumbs_up.pdfIn PDF document text
    • https://nokifafib.weebly.com/uploads/1/3/4/5/134597692/paxudusejufuv.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/88354980838.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/lirapepenutavorefelajev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mokamoba/jedezubowusid.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/rininabokojaxerejove.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/gmail_can_t_attachments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cb1a3e-6fec-4a1f-af9b-77496fcc89d7/salifatilufixoluvapiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fe5695-ca4e-4957-b3b0-39b01c102040/21188000596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdf1d78-c4b3-4e16-bcf4-629dd25fbf2c/how_do_you_calculate_probability_and_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88678e94-4902-4bbe-aa95-404bd9cccdf0/how_the_grinch_stole_christmas_story_youtube.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 5232 bytes
SHA-256: a7078b9f8f2c08f85d593c1e756c8c17ce768d5b0f62a49e60e2dde882c5df8c
font_01_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 11292 bytes
SHA-256: ef0be63792635046e5ab1e19b7967d5099aca0710e8500a92e42553d8a743964
font_02_sfnt_off00013ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71