Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdf465b037aabb9…

MALICIOUS

PDF

81.0 KB Created: 2021-03-18 16:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 61b67898dab90fe6119a60fce2ea5347 SHA-1: 5509a95db847fb12059311faa7fd0835bd5ca0f4 SHA-256: 6fdf465b037aabb97f68e8aaff711ede1f0707785320e23e4acc4f8f9131849c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://xezojetit.ru/award?keyword=exercices+amplificateur+op%25C3%25A9rationnel+pdf PDF link annotation
    • http://waguzeb.66ghz.com/pubg_aimbot_apk_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_605279326deb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_602f83105a22b.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/danielson_framework_lesson_plan_template_editable.pdfIn PDF document text
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/9739952.pdfIn PDF document text
    • http://topfrag.rip/370590324947d4ys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_60155be204886.pdfIn PDF document text
    • http://wavasesinile.22web.org/freddie_mac_guidelines_2018.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/3361935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_602ea657a565e.pdfIn PDF document text
    • http://majedox.iblogger.org/what_are_the_elements_of_a_short_story_and_their_meaning.pdfIn PDF document text
    • http://xtina.online/countless_or_open_scenes_for_theatreutw8a.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/f66995052753b.pdfIn PDF document text
    • http://lonuromaz.iblogger.org/how_to_remove_sim_card_from_lg_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60356c3d2f1c3.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
    • http://gipanitefoj.epizy.com/healthy_eating_plan_for_weight_loss.pdfIn PDF document text
    • http://jasixerebav.epizy.com/raresan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a32ec6-0a52-4a3a-baa6-444b813f1beb/boxunogupaxixidajixekol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77acf470-cec0-4e1c-8acc-b8e61e344309/44322185845.pdfIn PDF document text
    • http://deneboj.rf.gd/how_to_use_easy_touch_pentair_water.pdfIn PDF document text
    • http://davojuke.epizy.com/simple_cursor_adapter_in_android_example.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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 5352 bytes
SHA-256: d0bb163505abbde00586157538b00115b1ee6c7218575a9dec3f43d0680c079e
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 11960 bytes
SHA-256: 97849bb6583966e20c3e13f33e7bbfa208a425ef694a4f863d59a64d0099f1a7
font_02_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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