Malicious PDF — malware analysis report

Static analysis result for SHA-256 189ce1c2e8317271…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 10:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aa4763c14c81edf3e94a665956a934f5 SHA-1: df2a7c002ea99b960782c3da917586e187d48dcf SHA-256: 189ce1c2e8317271dcc568aa3a01c7bfd9da4cf732609de84dde1ca73dfdab49
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains and file-sharing services. This suggests a tactic to distribute malicious content or phish for credentials by overwhelming the user with links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://bologen.ru/123?utm_term=chicago+manual+citation+footnotes PDF link annotation
    • https://tidopotixasajev.weebly.com/uploads/1/3/0/7/130738881/977f92.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/muzomiv.pdfIn PDF document text
    • https://vutojakapejir.weebly.com/uploads/1/3/4/8/134895653/9268892.pdfIn PDF document text
    • https://zepekofudi.weebly.com/uploads/1/3/1/4/131407423/boliperevisupa.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/4311211.pdfIn PDF document text
    • http://jawunefuda.mygamesonline.org/86397419825.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/multiwii_configurator_linux.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/514f4.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/tobobobodami.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/dixodo.pdfIn PDF document text
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/xabaso-jatepuxidisad-xaxamiluvusoke-ridezaxobuweki.pdfIn PDF document text
    • https://kapexuzavum.weebly.com/uploads/1/3/4/6/134691047/xefisojo-jogedusosulo-walufokaritefo-ditasapima.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/jikotidukegurukaxekomakaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_2c9ca8d36b014ebba5b9e0a59e9f85d2.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_466d6bdf95ed4553ace8f47c38fe4bc0.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_965fd2c0904f48ba80e82a73672c33cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca78e0bc-3634-4d34-bf8f-54b9c1a9cd16/how_hot_is_the_burger_king_spicy_chicken_sandwich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a8e821-e65c-4a12-925f-4602325d80cc/lopi_1750_wood_stove_for_sale.pdfIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_3beb0486ad3947a6a37a825228eb636d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ddf413-55c0-49a9-ba83-5f91d54514b5/sotokawodakemafugeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012de643-4cf5-44ae-92d7-bcb275c09fa3/chartered_financial_analyst_course_duration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ffae85-29f1-411c-bc78-8d4d75af420a/goodwill_day_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8a7941-11ec-478a-a731-d05071a30cd1/jeep_wrangler_hardtop_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d27a540-89e8-4f88-941a-d09909c89ba2/how_to_apply_cast_member_discount_on_shopdisney.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_b16b823ba111403386129f3738b06cdc.pdf?index=trueIn 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_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 5104 bytes
SHA-256: 1905ec293d979f4c76cb49d866e41c1de3cc975506836986ec4dac68c23ef40e
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 10480 bytes
SHA-256: c307b9eaad40b32d2e0a0f0f0677b31555535c55bbd76badab4ce73b3b01a471

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