Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d22e20e0a85a3c8…

MALICIOUS

PDF

71.9 KB Created: 2021-06-09 16:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 62ed30bf668d6a083570fb3b7e4a4c4e SHA-1: 374032530af46e691cc2a9332b7a318968e09f7e SHA-256: 1d22e20e0a85a3c8fdedb8ceed3b80a3906a4992a896b6a5ed529c12c3960c0b
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 0.9998

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://krisoc.ru/pbw?utm_term=possessive+pronouns+that+stand+alone PDF link annotation
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/fb44c821d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_5fd10330dd0f0.pdfIn PDF document text
    • https://lodiwuziwinum.weebly.com/uploads/1/3/4/5/134502140/c3141.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/kovabegerenised-sekadivowog-lutuvepap-lowubara.pdfIn PDF document text
    • https://fexazajix.weebly.com/uploads/1/3/4/6/134669695/robenasasu-ruwajenuxodabo.pdfIn PDF document text
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/6467134.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/3403661.pdfIn PDF document text
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/xozojofepuxam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_601348b359d86.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/892e80c5-76f6-46e0-b417-297c5ba06bf8/zuvejoxixim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1836063e-1c69-429f-bc2d-99ffe081dc46/how_do_dolphins_help_the_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c46d3f-e8d7-467a-a3d9-2b47f74a3caf/is_the_book_and_movie_the_help_based_on_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e361b4-db2d-4a93-a2c2-72c1ec12a7b3/lovijepevetiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad81d2df-7781-44ab-9796-e002b3069f28/toraxupujorukit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee450c3-4f54-4fb8-8e1a-a2747b57253b/printable_pictures_of_jack_skeleton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3170875-2387-472a-9bdf-0587d150a07d/how_to_share_on_facebook_as_a_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21a0fb9-ccc4-41b5-976e-89efd7edf384/opinion_essay_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/decaf7ed-1c53-4ce4-89b4-36c70e130482/glencoe_algebra_1_chapter_4_practice_test_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722997d1-cd97-4230-8ca0-259ff635f3b3/samsung_rf267_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52aade99-6c47-414e-924f-81214175ad46/the_iron_skillet_kingdom_city_mo.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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 5108 bytes
SHA-256: 518830edff6625a54774f8210a994ca5025b74178b5587fc17ff720face9f580
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10224 bytes
SHA-256: cce45e3d930ceda1d16719f69b3af9a353c0a4e41a91c03e5d4ff878c89bce82