Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c0f58802c8e3ba…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 20:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc7a803771ec04f737a43cf8e1833b29 SHA-1: e4ddf4a77f896d3963cf7bbb256fb2115b642b23 SHA-256: 27c0f58802c8e3bacb10d6731a8ad05b96d94ed0fe99804eaddb3298b340dab9
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, and one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to job descriptions, aligning with phishing tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crophysi.ru/123?utm_term=regulatory+reporting+job+description In PDF document text
    • http://mobutadaxez.medianewsonline.com/foromajirogexuzujujilazo.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/hamilton_beach_dual_sandwich_maker_recipes.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/xotejirinapimitodidep.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/dikukukuvojo.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/8522912180.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/kijizopozulowaziredujar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_3278ac1c901a4acaa6db81dff27c8b64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/657252e6-0279-4c6e-8ee7-a527f79aed0c/honda_gcv160_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f785d0-018f-4226-ab26-b4e69ce7ee48/15483118537.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/rowisuwomotisolitemab.pdfIn PDF document text
    • http://zuputes.atwebpages.com/can_automator_convert_to_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/64338891350.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/fekaxuponepoteme.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/akcent_thats_my_name_video.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/lafuneze.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/13492788526.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_a9e7e6ec77074c738b3bfb93dfc5c770.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d79d9e-10ef-4386-8556-982700f344a4/craftsman_lt1500_drive_belt_diagram.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_81c9bd8434714e428a9fe98b04d09d80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e77fda-1875-46e1-bc65-6b788d16037a/kawosebuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f26df3-8699-49cf-ba1c-6f897866e6fd/19131028316.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/how_to_change_resmed_airsense_10_filters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e74035-fafd-4540-8ea4-a2fbb0cb272e/11628534764.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_3c15e5398cac477fa5b7fbea122981e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff492f1-2fd0-4354-aa5c-89ea64b39d93/new_look_off_white_denim_jacket.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_30d322cb2d104ac1be0ab40dd085a450.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_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 5564 bytes
SHA-256: 7868165e956a1110dced5c1bc7d644709f77bab865b1d24d512e9d43ed501701
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 10684 bytes
SHA-256: 12b904cf1c82cedca1d25fa18f61e414943b1834e577d8e53dce35c45527cbd0