Malicious PDF — malware analysis report

Static analysis result for SHA-256 05423c78779e3b87…

MALICIOUS

PDF

42.5 KB Created: 2020-03-28 02:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec90a98c65c9f39bbb851503620506b4 SHA-1: 1827c4c537932d35db97dc276b5cd8907a437921 SHA-256: 05423c78779e3b87d763232654fcc88cda84a1856f910232ad47ae7ce32e709f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, identified as a 'PDF SEO LINK FARM' heuristic. The embedded document body text, though partially corrupted, contains a URL that is also present in the list of extracted URLs. This suggests the document's primary purpose is to redirect users to a network of other documents, potentially for malicious purposes such as SEO spam or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://consciousrealignment.com/uploads/1/3/0/2/130288542/130288542.html#notacion+cientifica+ejemplos+negativos+y+positivos
    • http://happyhealthysane.com.au/uploads/1/3/0/7/130776113/gexadalopo.pdf
    • http://elitebathrefinishing.com/uploads/1/3/0/6/130604548/nakajadoz.pdf
    • http://selectiveinsurancecompanyofamerica.com/uploads/1/3/0/7/130775023/dexekubovorosemamapi.pdf
    • http://delabloom.com/uploads/1/3/0/6/130620987/1105847.pdf
    • http://nhteambuilding.com/uploads/1/3/0/2/130274076/1a537bbdc.pdf
    • http://onlinewebcammodels.com/uploads/1/3/0/7/130738855/nuxigo_diluduj_linunulimusigov_biraraxan.pdf
    • http://woodlandmultifaith.com/uploads/1/3/0/5/130541552/609901.pdf
    • http://mta-sts.mail.kunstnebel.ch/uploads/1/3/0/5/130539758/3ffa1b8ca808d2.pdf
    • http://graphite.agency/uploads/1/3/0/8/130874240/d7442674cdd.pdf
    • http://radiantlines.com/uploads/1/3/0/2/130287973/a45c2f585829ccf.pdf
    • http://jllcapitalmarketsriverwalkii.com/uploads/1/3/1/4/131407036/1d22b.pdf
    • http://bluetorchinvestments.com/uploads/1/3/0/8/130813714/bekuboru_zodojeto_nopumuwemeta.pdf
    • http://offmarketglobalcre.com/uploads/1/3/0/4/130483923/3306591.pdf
    • http://bamsalesteam.com/uploads/1/3/0/6/130605041/fuleme.pdf
    • http://fuckchrist.com/uploads/1/3/0/6/130621579/68a43c4206873.pdf
    • http://jjuliusenterprises.com.au/uploads/1/3/1/0/131070166/9212998.pdf
    • http://patleeart.com/uploads/1/3/0/6/130621451/dafukulexaxusumonara.pdf
    • http://tasteevapesonline.com/uploads/1/3/0/5/130551053/nonoko-tutogasupenilu-ligulezatefofeg.pdf
    • http://hvitejenterkanikkesyngeblues.com/uploads/1/3/0/6/130621964/temiwez.pdf
    • http://newrisestrategy.com/uploads/1/3/0/5/130542972/266519.pdf
    • http://agilitymassage.com/uploads/1/3/1/1/131164534/walezozuju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a23.bin
6809e97bae004b8182ecd05d0c114e752f53e53b362cbbaede9b54084f81e1f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 8856 bytes

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