Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef648f32d4316a5…

MALICIOUS

PDF

48.8 KB Created: 2020-04-01 17:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ea6fd80118886441a85d9f12d59aa2c SHA-1: b6dc8caca3ad1b6245570d84a2ac4050c241dbb6 SHA-256: 6ef648f32d4316a565df1f852ef2a0e8407568db7010ca831fead04add589616
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text is largely unreadable, but the presence of numerous URLs suggests a link farm or distribution mechanism for further malicious content. The primary attack pattern observed is the embedding of a mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://julielinkins.com/uploads/1/3/0/4/130477018/130477018.html#escalas+de+temperatura+en+fisica+formulas
    • http://dorothyradio.com/uploads/1/3/0/2/130287537/nezaxunu_zegetuwebukig.pdf
    • http://premiersolutionsservices.com/uploads/1/3/0/5/130551467/vujadakurekezov_toreb_gutovorefip.pdf
    • http://kulalucampkenya.com/uploads/1/3/0/4/130489168/kuzunemijeleb_pekofesom.pdf
    • http://phtrial.com/uploads/1/3/1/3/131380284/nikubenuroragiw_tapuwo.pdf
    • http://secondchancecommunications.com/uploads/1/3/1/4/131406395/4d4e5332.pdf
    • http://makeupbycourtney.com/uploads/1/3/0/9/130969614/nokutoduxixorufide.pdf
    • http://mediapainrelief.com/uploads/1/3/0/6/130639643/tusinotikitowezuba.pdf
    • http://withinrange.org/uploads/1/3/0/9/130969926/c1004619c3.pdf
    • http://wakeupproductions.net/uploads/1/3/1/4/131438110/jukotodagutigopud.pdf
    • http://knowledgeonthespot.org/uploads/1/3/0/7/130738567/5e17079da848f8.pdf
    • http://destaethiopiannj.com/uploads/1/3/0/7/130776594/3234736.pdf
    • http://alquilerconstrutu.com/uploads/1/3/0/6/130621613/8178599.pdf
    • http://tinasfunforfive.com/uploads/1/3/0/6/130621031/wazudifovegodoz.pdf
    • http://astrowitchcraft.com/uploads/1/3/0/2/130289532/6f9c5a90bc9b.pdf
    • http://americankappleiks.com/uploads/1/3/0/6/130620763/jojulisujib.pdf
    • http://divineelevation.net/uploads/1/3/0/6/130603814/fc9ff1.pdf
    • http://hopefullynotbroken.com/uploads/1/3/0/2/130273980/c035014.pdf
    • http://culinaryathomellc.com/uploads/1/3/0/5/130538839/jorigatokoro-goniworuv.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e4b.bin
5628b812c5aeaea50569ee3294cd76a2f5a095242b07f1bb30021804c9e3cef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4B 8836 bytes
font_01_sfnt_off00009e9e.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9E 16096 bytes