Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3daec5ecef1d7b…

MALICIOUS

PDF

79.3 KB Created: 2021-06-02 10:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 55ffd39ab2a3eef37786fa4e27f6ea06 SHA-1: e9abe47838aea9ff4d4f971350a76a399ddb667a SHA-256: bb3daec5ecef1d7b0967694d79f49041114671b431dceba27ecd85197f7d5c52
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://yafferge.ru/123?utm_term=bible+tagalog+apk'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=bible+tagalog+apk In PDF document text
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/sezufevarawawojamini.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/c7dd8eaa7dbf875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418362/normal_5ff9ce2a85cb9.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/b462d3.pdfIn PDF document text
    • https://watibovogop.weebly.com/uploads/1/3/4/8/134876481/jupokew.pdfIn PDF document text
    • https://ruvikofaxum.weebly.com/uploads/1/3/1/3/131380889/xiboxivasanufolexis.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/tukinag.pdfIn PDF document text
    • https://divopugizupuja.weebly.com/uploads/1/3/4/4/134487222/906273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_5fdc457fb4f23.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/5f66f637040.pdfIn PDF document text
    • https://riwalurofuv.weebly.com/uploads/1/3/4/6/134602121/nofoxufapumegop.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/jakiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_6051721a35b56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77aff8a4-ae77-49a0-9bd7-0551add3dd59/paxanomofulenivorira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3409e1b5-b57b-4f7d-8621-50c06efb4218/echo_srm_225_trimmer_head_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6d6ea8-effd-40c1-a601-aecdd26998c1/i_gotta_say_today_was_a_good_day_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6520b291-eb4d-4768-94bd-bf66de2d1b97/fibiperiwuvenum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b7840f-1a31-431c-805e-5f01f80bab90/icewind_dale_ee_npc_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4fdf33-4818-4584-841f-42a1b1aa3cca/como_el_grinch_rob_la_navidad_guion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688eec0b-294e-4c43-bc51-b3909f38c2d9/thuppakki_munai_movie_download_tamilgun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8ca1af-0f39-44b8-ab1a-1b772fd211ad/are_tanning_beds_open_near_me.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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 4968 bytes
SHA-256: 000db09be3e55402230f11f642918c30118b34867be0a65b7c5c7dc340877d49
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 1772 bytes
SHA-256: b44234b99998f6faa0297193f745ab57bbfde2d736c89d064edb68d8857b7b3f
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 11088 bytes
SHA-256: 4f27f4cbd95d33760b9a7422eea24454edc4c4aa72854a98b53fd08fd940a1fc