Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a010180ce66fea5…

MALICIOUS

PDF

84.1 KB Created: 2021-05-12 13:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 163645344f9e02f88e38c2ecd67d40c1 SHA-1: 1f431eb88930773b7e0e50ce80f3341a0b01f0f7 SHA-256: 5a010180ce66fea5e716e79539b80e03353dd45639b8cb1aec36466e3e5fa186
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The document body, though malformed, suggests a lure related to drawing tutorials, which is used to disguise the malicious link farm.

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://jumiwimov.ru/strik?utm_term=cool+things+to+draw+step+by+step+for+beginners PDF link annotation
    • https://cdn.sqhk.co/loganidob/idjbjcy/39602848994.pdfIn PDF document text
    • https://xusudunegowubub.weebly.com/uploads/1/3/0/7/130739081/zasija.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/jjHTDBE/gauss_meter_home_depot.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/hgsgiSg/trust_fund_management.pdfIn PDF document text
    • http://autokenn.com/change_android_sdk_path_visual_studio_2015qfewv.pdfIn PDF document text
    • http://salleapp.xyz/falananapelutih18ul.pdfIn PDF document text
    • https://tubababekegoso.weebly.com/uploads/1/3/4/8/134880125/5972534.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/ggIkmhe/greatest_hits_of_all_time_rock.pdfIn PDF document text
    • http://sluzhba1.net/kewofituwuvepitomugind76aa.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/hbahbDx/bomber_jacket_leather_sofa.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/hgdichg/punavavode.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/ggbjh3k/nunirexeju.pdfIn PDF document text
    • http://mmeueue.space/fifa_19_fut_card_creator_fifarosters258yf.pdfIn PDF document text
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/xozev.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/1Rwibbr/9_months_pregnant_game_cheats.pdfIn PDF document text
    • https://tutamedu.weebly.com/uploads/1/3/1/8/131856186/bugadorezagigusena.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/jvMhjhg/gamestop_game_boy_pocket.pdfIn PDF document text
    • http://avto-document.site/alliance_laundry_systems_manualsddsw9.pdfIn PDF document text
    • https://lurutedus.weebly.com/uploads/1/3/4/7/134775874/rubitogadelaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/MG1tPic/xezeniboxepuxibak.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/ihgQRjh/colors_of_the_rainbow_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/oLqhiji/81536006353.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/JojhgeS/kizidalojiju.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/CVClhgi/zakimiribi.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/0V4O4J7/coda_di_volpe_brunch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 5540 bytes
SHA-256: 57dd0804d82995c0af772bec09722b3f35713b47acd9d818fe7cc6586354d715
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 10592 bytes
SHA-256: 0c3975d30c590f9648a99ce0957cd749b7d08284c5c4e9ee1e6bd9bbccfa2d05
font_02_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 16328 bytes
SHA-256: b5fbaaa4af9b36882f9d831a885ef238a37545ab26d417bac7d8f56cddfd7376