Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b81db68dbfdaae0…

MALICIOUS

PDF

41.9 KB Created: 2020-03-23 09:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6d6d7383eac3db35196570b52e292c9 SHA-1: 594f33c57661c24a4185be76202a246fd2dafbd9 SHA-256: 0b81db68dbfdaae0c8683a31cb707e2197d6985e15a5ccb9990059716fbe80d6
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are algorithmically generated, indicating a link farm or SEO spam tactic. One of the embedded URLs, http://johnnyappleseedofaphasiaawareness.com/uploads/1/3/0/8/130874146/e927e06.pdf, is specifically flagged as a random URL link. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, contains references to URLs that likely serve as lures.

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://thesweetmission.com/uploads/1/3/1/1/131163793/131163793.html#girl+on+the+train+author+new+book
    • http://pairdbeauty.com/uploads/1/3/0/3/130313489/c9695.pdf
    • http://www.boiboillc.com/uploads/1/3/0/2/130272955/boxevulizil.pdf
    • http://extddivingcenter.com/uploads/1/3/0/7/130740623/zujefonotesexab_zavagubizegise_wimefenetorezox.pdf
    • http://myeneeproject.com/uploads/1/3/0/9/130969075/wupixijasamub_wokoma.pdf
    • http://industowerltd.com/uploads/1/3/0/8/130814225/be0dd53ef16.pdf
    • http://monuem.org/uploads/1/3/0/7/130738537/214a4b9ef.pdf
    • http://www.suzannemooreceramics.com/uploads/1/3/0/5/130545998/9277338.pdf
    • http://remote.keysoftwaresystems.com/uploads/1/3/0/8/130814088/xupet.pdf
    • http://teaby.me/uploads/1/3/0/4/130476050/mitut.pdf
    • http://finland100usa.com/uploads/1/3/0/5/130551210/6171829.pdf
    • http://1-800events.com/uploads/1/3/0/7/130740140/xemigirapup-wabeza.pdf
    • http://mybestieswholesale.com/uploads/1/3/0/5/130588216/desutipujadon.pdf
    • http://johnnyappleseedofaphasiaawareness.com/uploads/1/3/0/8/130874146/e927e06.pdf
    • http://www.melaninart.org/uploads/1/3/0/2/130288361/ladupopuz.pdf
    • http://lippincottllp.com/uploads/1/3/0/2/130273931/24dfb44d.pdf
    • http://mail.flowhoodriver.com/uploads/1/3/0/6/130640067/8669068.pdf
    • http://rjnagy.net/uploads/1/3/0/6/130639052/wegetulonu_bemobexajidaza_vupinekenoduxaw.pdf
    • http://westkendall.org/uploads/1/3/0/6/130605074/tavuzubeboniwo.pdf
    • http://nataliegoldfein.com/uploads/1/3/0/6/130604758/kubapi_zixud_dogotapirolagu_milinamasitow.pdf
    • http://globalgovernanceresearchfund.org/uploads/1/3/0/4/130476144/noreta-zudukapop-pigatibamiv-polemepe.pdf
    • http://mail.trudietendolleedelsmid.nl/uploads/1/3/0/4/130493968/1376028.pdf
    • http://treasuresforeducators.org/uploads/1/3/0/6/130604368/dopiwefakezoja_wadarosobud.pdf
    • http://mdsvault.com/uploads/1/3/0/5/130541221/vomagavabevid-kodeduw-kaxutijut-bupojigapitaga.pdf
    • http://chiefvoip.com/uploads/1/3/0/6/130639410/1964028.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_off00007a20.bin
c841ac4e0025c510fe5ed321984000a5d44640d5923f2e7c80f0fbf2c40ac7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A20 8152 bytes

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